Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e60d6bf04cb42f…

MALICIOUS

PDF

75.6 KB Created: 2021-06-04 20:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: afff60cb1b7cbfc3b2b8e1e8d9be8510 SHA-1: e781577ecfb8c7d2ea18649c1755fe1a27888a35 SHA-256: 85e60d6bf04cb42f3bc2dc20f42e5a6d5761b71b5d4d7cf9705627c6221e88f0
194 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic findings point to the creation of a link farm with numerous external PDF links, many hosted on disposable domains, suggesting a phishing or SEO spam campaign. While no scripts were explicitly extracted, the PDF structure itself contains embedded URLs that are part of this link farm, likely intended to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://irlanc.ru/pbw?utm_term=bianchi+via+nirone+7+105+review+2020 PDF link annotation
    • https://kigokowolabewal.weebly.com/uploads/1/3/4/1/134132594/kagurapi-sezebojexunadef.pdfIn PDF document text
    • https://koborabi.weebly.com/uploads/1/3/0/7/130775888/9c89149bd149.pdfIn PDF document text
    • https://buvewetaki.weebly.com/uploads/1/3/0/7/130775635/13110.pdfIn PDF document text
    • https://taketelufi.weebly.com/uploads/1/3/4/7/134745639/bikenitewu.pdfIn PDF document text
    • https://gavuwili.weebly.com/uploads/1/3/1/0/131070236/702c5a.pdfIn PDF document text
    • https://diwujuxopawarow.weebly.com/uploads/1/3/0/8/130874606/42646a7649b.pdfIn PDF document text
    • https://wozaxopuvomu.weebly.com/uploads/1/3/0/7/130740129/91743b26c2a3a14.pdfIn PDF document text
    • https://rujogapojepon.weebly.com/uploads/1/3/4/5/134597846/xozur-xamelomusiwabo-dapikazaz.pdfIn PDF document text
    • https://pufigisefabu.weebly.com/uploads/1/3/4/3/134351441/9359639.pdfIn PDF document text
    • https://xuvuvigaxopezut.weebly.com/uploads/1/3/4/7/134721928/291147.pdfIn PDF document text
    • https://sejejuno.weebly.com/uploads/1/3/4/4/134447194/lukovipidukopure.pdfIn PDF document text
    • https://nimapefakapag.weebly.com/uploads/1/3/5/3/135324130/0c1ad80.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/972d9d0c-9122-478f-bd67-ca1effa95538/comptia_server_study_guide_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60467ff2-6cdc-40ca-80fc-2dbe7d81e513/84780355833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d890d6b-b339-4789-b609-0ea3c3ccc654/first_things_first_in_a_sentence_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4a89615-3e44-44dc-a766-1586d4df01d9/nirabejageremunerisowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b961b41-26ac-4bb7-95aa-632b5d363862/how_to_install_pirated_gta_5_on_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1823c6ce-300a-4ee4-95bc-ef13d412a73e/dynamic_equilibrium_anatomy_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa826910-a274-4732-b75d-2e975cdf781d/how_do_i_update_my_mcs_150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/199463cf-4df5-4ad6-a14f-e5bdeef34c23/how_to_make_buddhist_knots_rope_bracelet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/164c43f0-34f5-4a54-a5b7-1efd051d8e20/xibenimovubutirawurorik.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE598 5408 bytes
SHA-256: 63bc53ad4a679528af6f139c04bdbf9f6e94605882cb05a22e05e2658856efd1
font_01_sfnt_off0000f81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81E 11484 bytes
SHA-256: 49fa46b8423612305a63e4cc42b71f1fdba601ad71e3d0abd2323daa11445358

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