Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb695d88c77c2142…

MALICIOUS

PDF

80.1 KB Created: 2021-06-09 09:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5da39b3ff70c2cc4662396f94111e357 SHA-1: d93f94b917e43f76c6caadd76d7640adcfc36b6c SHA-256: fb695d88c77c21421a4fbefe64a94e075e09ecd1649fbfd7769715c5474d296f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://garglob.ru/pbw?utm_term=who+is+the+richest+person+in+the+world+in+2020 PDF link annotation
    • https://wudunuxez.weebly.com/uploads/1/3/1/4/131453857/49c4dbc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475863/normal_6031fc7e6e429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382407/normal_60113b3d86af0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377379/normal_5fdbdf3f2b5ef.pdfIn PDF document text
    • https://fukajupiboxa.weebly.com/uploads/1/3/5/9/135973929/9913576.pdfIn PDF document text
    • https://wosezobar.weebly.com/uploads/1/3/1/8/131856012/dukirulavebefole.pdfIn PDF document text
    • https://nulodikoz.weebly.com/uploads/1/3/2/7/132740439/1593621.pdfIn PDF document text
    • https://gukozorupo.weebly.com/uploads/1/3/1/4/131411088/b6e317f0fbb46a.pdfIn PDF document text
    • https://bezujopejot.weebly.com/uploads/1/3/1/6/131606295/8920087.pdfIn PDF document text
    • https://sukewemuzi.weebly.com/uploads/1/3/4/6/134668821/jaropelenes-tajif.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://uploads.strikinglycdn.com/files/d24b8cfb-be81-427c-8bb3-36508fcba0f6/95396531196.pdfIn PDF document text
    • http://zuwofig.pbworks.com/f/formal_apology_letter_for_missing_a_meeting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d787c84f-f35d-4f5c-8c5a-69a977e3ef54/36386666876.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40ef6b86-f841-4a5d-9b20-288091ad4f44/chapter_7_cell_structure_and_function_review_crossword_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eba3eaec-b397-4f4f-aa6c-de9875c91053/tusivepesel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38482e22-f9ec-4af6-9f0f-abac2a63b64d/97898327915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95db1286-174a-4a36-8d8a-91964173e2bd/tewatonoradogedo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acd93339-a7c3-45ab-9b94-3eada520cbcd/bajowoseroxomawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d98ec50-248d-49bd-920e-fd1a545ff977/success_in_clinical_laboratory_science_4th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2433e8b0-8071-42e4-9ef0-64bffd8e808a/kali_linux_default_password_live_cd.pdfIn PDF document text
    • http://tijigika.pbworks.com/f/how_do_i_write_a_business_plan_for_a_small_restaurant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dd07dd3-03c0-4b5e-a95a-4c594311ab1f/swann_4_channel_dvr_only.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_off0000ee9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9C 5120 bytes
SHA-256: 7355675c1ef49da006698a7ae1685d9680a2bebcf5113cfb572007a1d4e43082
font_01_sfnt_off00010019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10019 10548 bytes
SHA-256: 357b53e0ce58fdc2c24c30ad03413b203731d1eba2756b9afdc0f64be38105a9
font_02_sfnt_off0001243c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243C 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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