Malicious PDF — malware analysis report

Static analysis result for SHA-256 77374abc9e8e876c…

MALICIOUS

PDF

76.5 KB Created: 2021-01-10 07:57:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 06021ed84791b94f0a5ef243ec4e1251 SHA-1: 859592acf5e27c66460657106ceedb1c1f256e58 SHA-256: 77374abc9e8e876cd497c533bc0740436d804a2fbe63748421b9f0430ef74165
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://traffnew.ru/wb?keyword=best%20laptop%20deals%20amazon%20prime%20day PDF link annotation
    • https://site-1176958.mozfiles.com/files/1176958/majezefo.pdfIn PDF document text
    • https://pofewapat.weebly.com/uploads/1/3/4/0/134018592/bc2146a.pdfIn PDF document text
    • https://dilemawusufugo.weebly.com/uploads/1/3/0/8/130874642/kifiruniresufom-dexewibajobo-dewuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426059/normal_5fefcd53e41fb.pdfIn PDF document text
    • https://bewotababuruga.weebly.com/uploads/1/3/1/1/131163836/nazavivub-porawu-mafalemidubere-kunij.pdfIn PDF document text
    • https://sofubile.weebly.com/uploads/1/3/4/3/134380394/1180535.pdfIn PDF document text
    • https://site-1176699.mozfiles.com/files/1176699/server_2012_remote_desktop_services.pdfIn PDF document text
    • https://site-1084247.mozfiles.com/files/1084247/magic_mods_skyrim.pdfIn PDF document text
    • https://site-1176201.mozfiles.com/files/1176201/63032989593.pdfIn PDF document text
    • https://cdn.sqhk.co/xunalafugapa/hjBXgjc/download_manager_for_android_free_apk.pdfIn PDF document text
    • https://site-1174360.mozfiles.com/files/1174360/5895179127.pdfIn PDF document text
    • https://cdn.sqhk.co/vilomikov/gf8jh3R/81286017576.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420599/normal_5fafd8540e5dc.pdfIn PDF document text
    • https://noloturajikule.weebly.com/uploads/1/3/4/4/134486045/1734b4f0196.pdfIn PDF document text
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/xunufuno_jepofelikekoxu_vukotutinuwegim.pdfIn PDF document text
    • https://lafefetakizin.weebly.com/uploads/1/3/2/7/132712235/5325412.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/vonusirukete/33065591236.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

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_off0000ec59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC59 5304 bytes
SHA-256: 42d65e9cb8b8acbf085e0138c89baf338744fde82fdb39bef9e575adaad35724
font_01_sfnt_off0000fe5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5B 11444 bytes
SHA-256: 269331644f5b1fb1d32675967bb928af1b3438feb5486b45f994d7e97f27d179

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