Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fdcb4b8e409bff…

MALICIOUS

PDF

73.1 KB Created: 2020-12-23 00:34:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 8fba13dd6331c4e327f55113309cb808 SHA-1: 367ffc01abeb8ac2785b31f51ce052f18734e449 SHA-256: 81fdcb4b8e409bffd9c3ac0de6c6ba3414f01bd606020393354bce4a08cd9782
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/aws?utm_term=spotify+er+online+mac PDF link annotation
    • https://bojurejid.weebly.com/uploads/1/3/4/8/134887271/tafataserisujik.pdfIn PDF document text
    • https://duwiwobejul.weebly.com/uploads/1/3/2/7/132740292/lifozixifeg.pdfIn PDF document text
    • https://wazajatagif.weebly.com/uploads/1/3/4/3/134376275/fakupugologag_kixamizokepop_zaxomasokexiw_lonabinuziro.pdfIn PDF document text
    • https://jewafime.weebly.com/uploads/1/3/2/6/132681773/7df23b.pdfIn PDF document text
    • https://tajafakedebufu.weebly.com/uploads/1/3/1/4/131438499/ditixidepiko-zojesoviroxi.pdfIn PDF document text
    • https://worozimovazez.weebly.com/uploads/1/3/1/4/131406108/zugiji_reritupe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9a0296a-ad52-4340-b390-9fc5c76db57e/transformers_the_ultimate_guide_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fde7a4bff074777c9848638/t/5fdeb562e64f570315308bf9/1608430946678/cotton_jersey_bed_sheet_set.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6501137-faa4-4192-aa4e-ebbff7461736/65967464168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffb09167-e8a1-4f23-a522-ca11ccd60263/73076109541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4c3d770-355e-49b1-a4f0-399f44efb7bb/sonoma_cigarettes_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7bed7f8-70dc-4d61-8fb6-4fdf050cf885/adrenaline_ps_vita_3.65.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E5 5188 bytes
SHA-256: 7626eea80bc5d05575428f425ad3d289feb4ed7bbb3a282afd1a3c2bb45992dd
font_01_sfnt_off0000d57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57B 2024 bytes
SHA-256: 6edd2dc65f8cc0d4bfc465674af3a6957927c9580e196fa1f2ecab0bfce717d7
font_02_sfnt_off0000df12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF12 10052 bytes
SHA-256: 14634150801d6865b73c7b96f0760a2d4f66b58c09d685fd26d212818a23aeac
font_03_sfnt_off0001017d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 16428 bytes
SHA-256: 4ace36c441c7acc85311e74b7d435f36a8515fba8b00e979487a14a34b0b6e8a

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