Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c86dfb73a23e5af…

MALICIOUS

PDF

97.2 KB Created: 2021-03-17 19:45:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54908cb24e5a19df4b36d6013c42533b SHA-1: e1650065a985ea3cbb73eeeab54e96636f6268c4 SHA-256: 7c86dfb73a23e5af233c523e8c92a6ff4d55969b43aba766844a1daee8b27627
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, and is flagged by ClamAV as a phishing trojan. The embedded content, though heavily obfuscated, suggests an attempt to disguise the malicious nature by presenting as a worksheet. The primary attack pattern involves directing users to potentially malicious external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/123?utm_term=complete+sentences+worksheet+3rd+grade
    • https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/tatovixamanome_mawarizupule_gerajopiwepi.pdf
    • https://cdn-cms.f-static.net/uploads/4421637/normal_60100777ee2f3.pdf
    • https://static.s123-cdn-static.com/uploads/4403951/normal_5ffe90c79b00e.pdf
    • https://static.s123-cdn-static.com/uploads/4469828/normal_5fec014ce9517.pdf
    • https://cdn-cms.f-static.net/uploads/4444644/normal_60230d98d05f4.pdf
    • https://cdn.sqhk.co/sigidezok/hhhfwRU/gozutefe.pdf
    • https://jafukixago.weebly.com/uploads/1/3/1/3/131380625/wisomo.pdf
    • https://tariroviwobin.weebly.com/uploads/1/3/4/7/134715354/zanexizeg.pdf
    • https://cdn-cms.f-static.net/uploads/4450040/normal_603c881bec999.pdf
    • https://cdn.sqhk.co/lixozimiz/hdwidgd/endress_hauser_applicator.pdf
    • https://witaretazijaw.weebly.com/uploads/1/3/0/8/130813730/8071946.pdf
    • https://cdn.sqhk.co/wowixepis/rGigCHR/games_play_free_mobile_games_online.pdf
    • https://cdn-cms.f-static.net/uploads/4385009/normal_5fd67cf2a69b0.pdf
    • https://cdn-cms.f-static.net/uploads/4488137/normal_60113be3c0521.pdf
    • https://static.s123-cdn-static.com/uploads/4416131/normal_5fc9f2d51822e.pdf
    • https://cdn-cms.f-static.net/uploads/4464861/normal_5fd98fa0a41e1.pdf
    • https://cdn-cms.f-static.net/uploads/4427501/normal_6037c064c0003.pdf
    • https://nametipij.weebly.com/uploads/1/3/1/1/131164318/eac46ffa7d5e9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_18309c10585240f392bd409e02e7b457.pdf?index=true
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_b036b9bbe2364560a9e3f18c9c662ab8.pdf?index=true
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_74c864d3f10f4050863eafcdae20b88e.pdf?index=true
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_0f3bf58ca89d4ba384c03507ddeb70ae.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011887.bin
1b93901ec8d6d5671a0dd2d605e23dcee80bae75154947f7ae2a6b8272316ddf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11887 5572 bytes
font_01_sfnt_off00012b5c.bin
310cdb08ffdca95e196285e640df8b36bc64d6609b681b0623467ef01e779379		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5C 11760 bytes
font_02_sfnt_off00015390.bin
f6e0f4a25f18a144688c6b7f40519a5efc98c72643b9054f89526e396d9b459d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15390 16144 bytes
font_03_sfnt_off00016891.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16891 4324 bytes

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