Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0bd686dc9b6d3fc…

MALICIOUS

PDF

85.9 KB Created: 2021-03-17 00:47:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 303bde9371b7be353cc0581c8117e273 SHA-1: bf826229d95bea641c149e2f45ee364a472b348b SHA-256: d0bd686dc9b6d3fcfc5b1bcf9f32409d1c1ac4f3cbf654da9075ec5cfe25ca1c
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded links, many of which point to disposable hosting or redirector infrastructure, indicating a link farm designed to drive traffic to malicious sites. The primary malicious URL identified is dafemum.ru, which is flagged as a known malicious redirector. The document's content is minimal and appears to be a lure to encourage users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/strik?utm_term=heart+of+darkness+summary+in+urdu+pdf In PDF document text
    • https://sesogipe.weebly.com/uploads/1/3/1/4/131438268/xibawofigisizex.pdfIn PDF document text
    • https://maradezeg.weebly.com/uploads/1/3/5/9/135974492/26b324e326d.pdfIn PDF document text
    • https://xulajaxosu.weebly.com/uploads/1/3/4/3/134366267/bolagigamu-lawodijadutavi-mafez-jorefijelare.pdfIn PDF document text
    • http://pokupka.space/rent_old_school_cars_near_mevy72b.pdfIn PDF document text
    • https://repawuwo.weebly.com/uploads/1/3/5/3/135313919/mawukaku_sirux_vixukisu.pdfIn PDF document text
    • https://cdn.sqhk.co/pijajawopoji/ixuVyia/starship_troopers_battle_music.pdfIn PDF document text
    • https://cdn.sqhk.co/begokaxawip/jbDKbjj/66332273991.pdfIn PDF document text
    • https://cdn.sqhk.co/kufomopinu/jc0lhar/never_have_i_ever_show_cast_russia.pdfIn PDF document text
    • http://rankingcoach-apps.com/niserudk6nu.pdfIn PDF document text
    • http://virona.org/pandemic_meaning_in_arabicb491o.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/LJBib73/24983958302.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_7153b04169a8419586ba7d28b10ab89a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kegovev/sample_employment_reference_letter_template.pdfIn PDF document text
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_0ba2b0a2794944719d286a806d0d5297.pdf?index=trueIn PDF document text
    • https://ce722411-b424-48ee-ac00-b4ed8818edd9.filesusr.com/ugd/bff0de_33bc8e8b05854992824ed58947c77fc8.pdf?index=trueIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_7f44581087704a90a4f94bfec1f38f55.pdf?index=trueIn PDF document text
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_774faaab74ac4a2a893ced714a236b20.pdf?index=trueIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_7d0514bf66f14636883324c28586ca67.pdf?index=trueIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_e386faf8892544c9aefd114e96af7200.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/llm_guide_columbia_law_school.pdfIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_a7b3dc9778ee479da6d968b05b40c630.pdf?index=trueIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_b4023e10552b4503b893d5f587bc8ae4.pdf?index=trueIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_dcd082eddcdd42979e525052f24fab5b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farowug/asus_maximus_vii_hero_nvme_support.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE6 5280 bytes
SHA-256: d7d3b17e0939989f5022cdabe05d8ae5e05b14377149ef8b5b3131df369caca0
font_01_sfnt_off00010fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD9 10580 bytes
SHA-256: 360e327c253336eaee8b1faa8f1371656fb9266e545cee660759226c72b4b768
font_02_sfnt_off0001343c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343C 16140 bytes
SHA-256: 1ffca1ef16be5e2ec436e77f9211a88ad3199dc781cb76600401cc2e2c7dce6d