Malicious PDF — malware analysis report

Static analysis result for SHA-256 1629923a80d642dc…

MALICIOUS

PDF

88.1 KB Created: 2021-03-31 17:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5cdd061c87084fc0d8a01415712bea7c SHA-1: 14faf78d1f0e7d104e63d2d7f5bd1f60100a1a5b SHA-256: 1629923a80d642dcacc0123f1b20bb130c0ed7f159f8064d1360cca8981602a9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://kuzutuzo.ru/award?keyword=periodontitis+ulcero+necrosante+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369903/normal_5fc6725bdd974.pdfIn PDF document text
    • https://fadukopita.weebly.com/uploads/1/3/1/8/131856205/pefoxipok.pdfIn PDF document text
    • http://qrettalq.online/95096067069xveen.pdfIn PDF document text
    • http://forkidsshop.online/wolij3yi82.pdfIn PDF document text
    • https://xuxewisi.weebly.com/uploads/1/3/4/2/134235501/2222419.pdfIn PDF document text
    • http://crawlmqyu.space/madadagoabtit.pdfIn PDF document text
    • https://cdn.sqhk.co/wefegiwezon/Yhbosij/i_would_play_tennis_in_spanish.pdfIn PDF document text
    • https://zojipulororasa.weebly.com/uploads/1/3/6/0/136011419/7618923.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/fjjhejC/butterfly_3d_stickers_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/xajamenujo/NigZgjV/birthday_cake_images_with_name_editor_for_brother.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482228/normal_603fdaf75deee.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/lomuper/vawumanaruvapulul.pdfIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_7e42e06f17f84b71ad3385aa2a7fd6af.pdf?index=trueIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_992a990c71dc47c7a8d2171ecb742b96.pdf?index=trueIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_512c44662c5848898fcce5e7bf3ae5af.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xeponodij/android_9_easter_egg_nokia.pdfIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_ecc0fc8bd210442594479b6f145c3a79.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E5 5152 bytes
SHA-256: c922cc13fc8d89c765a009976dcc897208b542acb116e115de1a50d299a4ee03
font_01_sfnt_off00012979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12979 12440 bytes
SHA-256: ba3fac061bb5f8f572f93ecaa32592cd6a3b4db8cdd4b83f10313521abdcd471

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