Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf7730b7a9ff5bc…

MALICIOUS

PDF

71.4 KB Created: 2021-03-30 07:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a6edfe45a5804e7f954ca1371d507f4d SHA-1: e0c54684f71879da8bfd7e9eaa40ed9613418297 SHA-256: baf7730b7a9ff5bccbc960715077dc94db2c7cab27f316737d185bfb44098a71
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful sites. The document body, though heavily obfuscated, appears to be a lure related to a 'catalogue'. No scripts were extracted from this sample.

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://baarspo.ru/award?keyword=catalogue+schneider+residentiel+et+petit+tertiaire+pdf PDF link annotation
    • https://tupisefam.weebly.com/uploads/1/3/1/3/131383837/pepoduzuzeg_benetubetan_sowijolulidokat_totazo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476273/normal_5ff4734337a67.pdfIn PDF document text
    • https://fivoputan.weebly.com/uploads/1/3/1/4/131408393/5656393.pdfIn PDF document text
    • https://rokumewa.weebly.com/uploads/1/3/4/5/134529377/relelo-memija.pdfIn PDF document text
    • https://pesulomerusetus.weebly.com/uploads/1/3/4/1/134109359/01b4c3.pdfIn PDF document text
    • https://rejonogatu.weebly.com/uploads/1/3/5/3/135392998/wupalomadelikenaz.pdfIn PDF document text
    • https://mejofeva.weebly.com/uploads/1/3/2/6/132681501/fowasoram.pdfIn PDF document text
    • https://futokiwusilo.weebly.com/uploads/1/3/4/4/134458686/pemejebezuje_tomojuwagu_dexutuzej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383679/normal_60039cf48da5e.pdfIn PDF document text
    • https://tiseworadew.weebly.com/uploads/1/3/5/3/135317060/3909573.pdfIn PDF document text
    • https://jiditejebata.weebly.com/uploads/1/3/5/3/135305220/8161a.pdfIn PDF document text
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/d454db5e6.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/punurum/equivalent_fractions_pie_chart_worksheet.pdfIn PDF document text
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_a59c6572e7324a718f8330e8dcf9fdda.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/zuwowijanuliro.pdfIn PDF document text
    • https://2c91b947-1dd8-401e-ae91-d595f2f75867.filesusr.com/ugd/0af078_610ff0c6898f4ebb9e364d4c5343878c.pdf?index=trueIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_ed5a3cab0eca4bb0875df91d02ceae67.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35C 5320 bytes
SHA-256: bc1f85951fec708f855113d64f1b55966936a1cbc1d41e210842d7a034f7d9b2
font_01_sfnt_off0000e567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE567 12596 bytes
SHA-256: b5d1bf1d7d1ba900a7349cb8871d55326ebe779d2d8c3b37ea477f901531131e

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