Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa62cb9f3deb3f8…

MALICIOUS

PDF

105.7 KB Created: 2021-04-15 09:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9ef46550bb7326f7ee51c4942c4023c SHA-1: 33590a1ebe8cfaa3923849ec2c0550fc2cd6c3d5 SHA-256: 7fa62cb9f3deb3f8a1cddf56a609ef8225a7ddc90add221992069a7837421012
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The primary malicious URL, 'https://pelibifir.ru/strik?utm_term=star+trek+voyager+season+7+episode+13', is presented as a search result, suggesting a phishing or malware distribution lure. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=star+trek+voyager+season+7+episode+13
    • https://kolijegidixut.weebly.com/uploads/1/3/1/3/131379325/328b9e.pdf
    • https://bibawegosisuzu.weebly.com/uploads/1/3/5/9/135961680/2a3235e255fd2.pdf
    • https://cdn-cms.f-static.net/uploads/4379483/normal_602585119f224.pdf
    • https://famatogovux.weebly.com/uploads/1/3/4/6/134614416/jelotul-dulixulasowot.pdf
    • https://static.s123-cdn-static.com/uploads/4460072/normal_5ff47aa873237.pdf
    • https://cdn-cms.f-static.net/uploads/4373297/normal_6066a19a87c95.pdf
    • https://bafibosu.weebly.com/uploads/1/3/0/7/130738803/bb29e4cf795.pdf
    • http://fullhp.info/959206695066365u.pdf
    • http://findssldz.xyz/pogevuzouz4a1.pdf
    • https://falijufik.weebly.com/uploads/1/3/5/3/135349852/ragixijirozirujupeje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/30475a7c-fdad-4ed3-807c-391f75ce9ff2/what_is_a_good_example_of_classical_conditioning.pdf
    • https://uploads.strikinglycdn.com/files/1a3998de-c525-40d0-99fe-09fd6e54e917/blood_bowl_team_roster_sheet.pdf
    • https://uploads.strikinglycdn.com/files/94c50065-1042-4305-8414-942ae43a4385/fobasubuwajamu.pdf
    • https://uploads.strikinglycdn.com/files/636905ca-5b79-4c7c-b0bc-1b842e6e2617/70953941937.pdf
    • https://uploads.strikinglycdn.com/files/69ea9ec1-6e46-4075-aac9-3ac13f763295/cuisinart_2_quart_ice_cream_maker_reviews.pdf
    • https://uploads.strikinglycdn.com/files/8b0f1673-be09-4d9b-b022-cf7e510dcece/81626963417.pdf
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015ff9.bin
5e404973f6b7df531028af245b44a34effcc4d6b2d73cae2b72314f21fae1665		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15FF9 5720 bytes
font_01_sfnt_off000173a1.bin
4c868d260636d0d68d9e9993a8f7e60e05cff5198bb2d899a05c110fe1e3f189		 pdf-font-stream PDF embedded font (sfnt) at offset 0x173A1 11196 bytes

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