Malicious PDF — malware analysis report

Static analysis result for SHA-256 b485f817c99a114b…

MALICIOUS

PDF

75.7 KB Created: 2021-06-03 08:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b1b89799ce2ecedd09c51662ebf0c201 SHA-1: e7828384d0f887deaa8985c4cbbbb877cdd9ebd9 SHA-256: b485f817c99a114bc04abdd0b4c66f7baaa2ae4c38beecf4e5e650b26d6d99b5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/123?utm_term=anaphylaxis+guidelines+nice PDF link annotation
    • https://rufukowov.weebly.com/uploads/1/3/4/6/134665675/tonurug.pdfIn PDF document text
    • https://zifereli.weebly.com/uploads/1/3/4/3/134347484/96882.pdfIn PDF document text
    • https://sopowifumerage.weebly.com/uploads/1/3/4/3/134355846/domebi_wivurixuloj.pdfIn PDF document text
    • https://jizimixu.weebly.com/uploads/1/3/4/0/134095846/0c7b12efed595c1.pdfIn PDF document text
    • https://dukitupa.weebly.com/uploads/1/3/4/3/134393571/4bcc0031d5c18e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pinurakus.pbworks.com/f/is_li2_2-_paramagnetic_or_diamagnetic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69b5fceb-78c2-4836-b0c4-cc4fb4270fb4/what_your_fifth_grader_needs_to_know_revised_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbf96692-6abb-4107-91b0-695736f893ff/writing_equations_of_parallel_and_perpendicular_lines_worksheet_kuta_software.pdfIn PDF document text
    • http://vogituvu.pbworks.com/w/file/fetch/144508140/32985122073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b16ccf7-d030-4f7a-b52e-ec62c99ff922/fiburuzi.pdfIn PDF document text
    • http://pazimonofe.pbworks.com/f/77002648872.pdfIn PDF document text
    • http://jumedew.pbworks.com/w/file/fetch/144422616/bitzer_bse_170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a91e192-4d4b-4ac7-b3f5-b2b2df305ec5/what_can_you_do_with_a_nutrition_coach_certification.pdfIn PDF document text
    • http://sawanixum.pbworks.com/f/wapanu.pdfIn PDF document text
    • http://bojirakaj.pbworks.com/f/evermore_beauty_and_the_beast_piano_sheet_music.pdfIn PDF document text
    • http://rawumadakora.pbworks.com/f/63134504062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1953e611-f7dc-4927-80ed-abd270a379e6/is_ccna_wireless_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38489df4-d586-4e8c-be4c-1ad773d02b23/jiduzada.pdfIn PDF document text
    • http://sikovifif.pbworks.com/w/file/fetch/144459318/how_to_be_a_better_platoon_leader.pdfIn PDF document text
    • http://viluxese.pbworks.com/f/deweratumogotup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28c112e2-8d95-4b1f-83f2-499b73b1b66a/koxopigamisifove.pdfIn PDF document text
    • http://bovojigu.pbworks.com/f/vetezexapurokino.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCC 5088 bytes
SHA-256: 56a07113598a7cc29008c895f0c73f9ddcff4b8e10ea069bf0f6fd84947d100f
font_01_sfnt_off0000f110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 9956 bytes
SHA-256: 5c502dd7d565ef4a88478cd90c49ae73e9bef59319bf22c120503c73350aaf11
font_02_sfnt_off00011333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11333 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c