Malicious PDF — malware analysis report

Static analysis result for SHA-256 644788c841ca316d…

MALICIOUS

PDF

73.3 KB Created: 2021-02-18 11:26:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9d73f21f1d6fe5215d09f123a3349161 SHA-1: 8847444602fd56c869ae9c1a6cb0484f1a3a2cc6 SHA-256: 644788c841ca316d36d7d973913ed531e53fb31cd106592e6c73709643816107
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many on disposable hosting with UTM parameters, suggests a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains a query about teeth whitening, likely a lure to disguise the malicious redirection.

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://jottigo.ru/strik?utm_term=does+a+waterpik+help+whiten+teeth PDF link annotation
    • http://carinsusa.info/4105529638903x0i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454280/normal_6022096e4e3a7.pdfIn PDF document text
    • http://ipai.online/89459189655fokh1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476939/normal_5fed8edecc941.pdfIn PDF document text
    • http://storeyou.store/troy_bilt_power_washer_hose_sizebd16w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444856/normal_601a3228a7ecc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487419/normal_5fc5bedf008f0.pdfIn PDF document text
    • http://flash-sar.online/o_que__portador_de_trao_falciformeg0aji.pdfIn PDF document text
    • http://liketsven.xyz/57236467533xtlx3.pdfIn PDF document text
    • http://taxavifosobedul.iblogger.org/popojutaninovaw.pdfIn PDF document text
    • http://milanomoda.site/how_to_manually_turn_on_element_tvhziqc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gomupinoteripa.epizy.com/39953796100.pdfIn PDF document text
    • http://gidozowelixije.rf.gd/borajagusubo.pdfIn PDF document text
    • http://luzigipo.epizy.com/sqlite_browser_free.pdfIn PDF document text
    • http://lufafutogixafu.rf.gd/vijedogaro.pdfIn PDF document text
    • http://zapopododo.rf.gd/18052768880.pdfIn PDF document text
    • http://vuroxazejugu.epizy.com/gupiluwut.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_off0000e242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE242 5064 bytes
SHA-256: 82ebcca206bf1b2be91e976d607dc7873f2e67e0fb8fa0a916a10c1f881068ca
font_01_sfnt_off0000f390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF390 10760 bytes
SHA-256: b21e1ed122ca8bb328829986c49c130da59e2890c7964f8f76b67dbb2784cdce

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