Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc764f7e668d08d…

MALICIOUS

PDF

95.9 KB Created: 2021-02-24 08:27:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7c09bc1b3ef08f2fda690cb00bc92f73 SHA-1: a3f5e997b6f01cdcb3b716b2bd63bded09126ad9 SHA-256: cbc764f7e668d08d81ab0a05aa19e3bbdc92d18dde69b8bba01780739b9bb8b3
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 hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the primary function appears to be directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wb?keyword=distributed%20parameter%20systems%20examples PDF link annotation
    • https://sidutoxa.weebly.com/uploads/1/3/4/8/134886075/203e43ee4a.pdfIn PDF document text
    • https://jupepirime.weebly.com/uploads/1/3/4/3/134313464/a296256d.pdfIn PDF document text
    • https://vovasodakujex.weebly.com/uploads/1/3/0/8/130874601/fufufuzixel_pajaxapudofej_misadadimopef.pdfIn PDF document text
    • https://ponebivilu.weebly.com/uploads/1/3/4/5/134505494/7d7dfe800cf4286.pdfIn PDF document text
    • https://gorogonib.weebly.com/uploads/1/3/0/7/130775466/rixupejoxurus-rumazeb-nofav-xovijiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369332/normal_6006ad073a8c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408981/normal_5fce57b0d6c09.pdfIn PDF document text
    • https://jefolujolu.weebly.com/uploads/1/3/6/0/136096950/d178f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384323/normal_5ffcbe6b1d645.pdfIn PDF document text
    • https://jewelilug.weebly.com/uploads/1/3/4/3/134331877/jexokiw_vobovedewug.pdfIn PDF document text
    • http://fujubipe.22web.org/botegokir.pdfIn PDF document text
    • https://mifadumuvuvog.weebly.com/uploads/1/3/4/6/134689338/tafukawemipem-fagiwavivefoveg-rosobitosuja.pdfIn PDF document text
    • https://vesabigixovo.weebly.com/uploads/1/3/1/8/131857304/72760ef4bf18b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/90321203365.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/codeigniter_user_guide_version_2._2._2.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/albergues_camino_del_norte.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C97 5416 bytes
SHA-256: c9ec5e66526dd80d06411bb9db789794d7596697f69b6683ead248865752451e
font_01_sfnt_off00012ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF2 13004 bytes
SHA-256: 339d44f488e2f061b2276f451d4346703fbdb31728c675c40ce0802c575b65e6
font_02_sfnt_off00015bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BAC 16544 bytes
SHA-256: 483e74746ab2aea641b6ff0bfde1231f22b63ae994170cdaa7a3b10c75e4beaf

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