Malicious PDF — malware analysis report

Static analysis result for SHA-256 32490f4f45590323…

MALICIOUS

PDF

78.4 KB Created: 2021-03-29 17:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 22ea400e6637d0f52d1a43a079a6b336 SHA-1: 10026c6ff0d8b5256010913b367945b25cc29f27 SHA-256: 32490f4f4559032313295e7f915f4d07c3af8c0ab266e70e083c758d6b345c2e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/wix?keyword=3-4+activity+secondary+source+analysis+worksheet PDF link annotation
    • https://cdn.sqhk.co/xekobigi/jihgEVi/free_online_invitation_templates_minnie_mouse.pdfIn PDF document text
    • https://tuvopezape.weebly.com/uploads/1/3/4/7/134712323/da0d41f089c.pdfIn PDF document text
    • https://mapulanedubo.weebly.com/uploads/1/3/0/9/130969056/1954434.pdfIn PDF document text
    • https://leduzurukidep.weebly.com/uploads/1/3/4/8/134858842/geruz_xukafonokimifej_lupofatox.pdfIn PDF document text
    • https://gadonivoxe.weebly.com/uploads/1/3/5/3/135331758/2d2980272d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484355/normal_603c16d52c62b.pdfIn PDF document text
    • https://moredotaze.weebly.com/uploads/1/3/0/7/130776260/jibekezugexodun.pdfIn PDF document text
    • https://cdn.sqhk.co/daborofus/ijaGcV8/gerena.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417830/normal_6046f5e601883.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421341/normal_5fc639ded54a2.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/iijjiha/lock_screen_wallpaper_windows_10_free_download.pdfIn PDF document text
    • https://zumekaxiligub.weebly.com/uploads/1/3/5/3/135385258/b9fbfbffd.pdfIn PDF document text
    • https://ruzudagozigiwis.weebly.com/uploads/1/3/5/3/135394236/c17ee.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://0a9d52b7-bae8-445b-b6d2-8eba0f02533c.filesusr.com/ugd/729231_fbb3bece42ea4b68ad689f5a6f0a628c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d775a77a-9df8-48ab-aabb-f83188648941/integral_calculus_equation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7c65423-9528-4000-91aa-b1fdb0a01139/daikin_mini_split_error_code_reset.pdfIn PDF document text
    • https://a9b72ff8-ed6f-4212-96c6-d467cc4e2332.filesusr.com/ugd/7f5649_13c0a21ec5e44031ae5a61f2060e1bea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d7e50da-d776-4381-9ea2-6e86efaa9d4b/premier_protein_shakes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/881cb700-5cf7-48a9-9eb1-62b2fe745684/gewavamuxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9eaae3e-8823-48b0-8acb-ea444aee6c4a/geometrie_analitica_formula.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_off0000e779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE779 5416 bytes
SHA-256: 447c978038c3f1a340de1d93ee2e85e210d89fa115d279560f38789db98972f7
font_01_sfnt_off0000f9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EC 10612 bytes
SHA-256: 7bd58413c4e89a9bd4d63f54fa5aa80d04069525abbb280b16e07b650674bcf1
font_02_sfnt_off00011dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFD 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378