Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a0bb3e7eff1f55…

MALICIOUS

PDF

90.4 KB Created: 2021-03-26 08:40:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 01f091aaca4df29e3943d6753fe72a71 SHA-1: 52160de5c0c59c43f53103a0408cdf520b7eab7f SHA-256: 76a0bb3e7eff1f55b97aaa1c34fc9fc382b0dfbf57f95397ff98d429aff08086
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to disposable hosting services, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary purpose appears to be SEO manipulation or acting as a gateway to other malicious content, rather than direct execution of a payload within this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/wix?keyword=arnex+pocket+watch+wikipedia PDF link annotation
    • https://bopugokux.weebly.com/uploads/1/3/4/9/134901566/2d29145.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483851/normal_604a81dcde772.pdfIn PDF document text
    • http://douchely.xyz/antibacterial_activity_of_azadirachta_indica9a9yf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_5fe750140c3bb.pdfIn PDF document text
    • https://rujurujubawupof.weebly.com/uploads/1/3/0/9/130969172/fecffe.pdfIn PDF document text
    • http://pocki.top/zimisitobunevabufufrvi0i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404313/normal_5fc696eb5d9de.pdfIn PDF document text
    • http://lumacy.site/kagubozuwizotefasosezu10iao.pdfIn PDF document text
    • https://rotugufe.weebly.com/uploads/1/3/5/3/135315725/7673679.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
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_20fae39f024342c89e994bdd2497641d.pdf?index=trueIn PDF document text
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_3bcd55bfa6fa47c7aef2d9ce3d0d689d.pdf?index=trueIn PDF document text
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_a7dff9d8d4004edcbf9872b9e7ab8d67.pdf?index=trueIn PDF document text
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_8a4bf26b00fd4b528c4929f397667637.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f4574d9-60d7-494a-b4db-542cf77a9825/13863040551.pdfIn PDF document text
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_f0879e56490b4d9fb482abfba4512af5.pdf?index=trueIn PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_6ba5c4535c854c94a9afb42ce63d74c3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d20f7a9-0349-4e90-8c17-c0441fac782e/are_old_case_knives_worth_anything.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9da82a37-eb0c-4e44-9732-ea802ba3173a/blackdecker_20v_max_string_trimmer_edger_lste523.pdfIn PDF document text
    • https://d0f5cf02-e55f-42e7-ba97-8a4d5a2b8368.filesusr.com/ugd/7f59a0_fd6d91befa144f95b1460aab0cae23b3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2a4ab7c-ac80-4df2-84f3-6e8dd41ea6da/accu_chek_performa_e7_error.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_off000116fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FB 4952 bytes
SHA-256: 0ffcef531e64b01eca7ab7eb7d4010ee3d376f18ecec2038d4a7e4d836f8af2a
font_01_sfnt_off000127cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CD 11280 bytes
SHA-256: 4ba76d0fe5b59101ac32187689b221129563a9233d9360b223a1af2d206ed4c6
font_02_sfnt_off00014df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DF6 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3