Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd167818eaa1cd3a…

MALICIOUS

PDF

71.9 KB Created: 2021-04-03 20:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1b029f67104db745add48729aa89e5ff SHA-1: 9dfa0b03d66bd26955aabe59bda7ff3eafad008b SHA-256: bd167818eaa1cd3afef98be96fb2ac767f565333d1819f6a4fce69113d858940
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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/wix?keyword=ap+human+geography+chapter+5+vocab PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501027/normal_60217f8ece2f3.pdfIn PDF document text
    • https://kerozuvesiduzam.weebly.com/uploads/1/3/4/3/134375161/diritijedudosod-nafekogowajidom-nafimutik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530868/normal_5fedca874ec34.pdfIn PDF document text
    • http://mabirimelu.iblogger.org/puffin_browser_lite_apkpure.pdfIn PDF document text
    • https://goxepafanaba.weebly.com/uploads/1/3/0/7/130739763/5170576.pdfIn PDF document text
    • http://gk-kuban.ru/xanexeminarefibi77ndo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403940/normal_5fc853d64ca44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454170/normal_5ff31c7b2be57.pdfIn PDF document text
    • https://tudogevu.weebly.com/uploads/1/3/2/7/132741144/98794995b458.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476146/normal_601db31bee6c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369772/normal_5ffe737d02015.pdfIn PDF document text
    • http://knitfqph.site/nuronelugatoj7z2a.pdfIn PDF document text
    • http://majelogajizivo.iblogger.org/63024260769.pdfIn PDF document text
    • https://vijamosikafej.weebly.com/uploads/1/3/4/7/134772382/sutosegowopuse-wowunaritapo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nilubipaviwi.rf.gd/64117523893.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/breakup_diary_images_hd.pdfIn PDF document text
    • http://todonoto.epizy.com/diary_of_a_wimpy_kid_free_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/89412465204.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/pikatoge.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA8 5552 bytes
SHA-256: 964073db49a72d85e02f1167eef099b17e808456814af7efebb1fd0ed693be30
font_01_sfnt_off0000ee74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE74 10532 bytes
SHA-256: 4c1bfc62bc04ac4b56725b3f8e19e9b63e427f1b5a83be6b26b1fa0ab7f2a507

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