Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3f2d5c2b677123…

MALICIOUS

PDF

78.6 KB Created: 2021-03-20 23:14:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d15ce66f7d7c202cbc0daaf4ab47f097 SHA-1: 5d22711a51d4ff7693438af3760aada54fb512d5 SHA-256: da3f2d5c2b677123423163083c0c494fdf9a401d45bc7cb90a2a8ac405a401bf
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document body and embedded URLs suggest a lure for downloading software, specifically mentioning 'adobe photoshop 7.0 setup free'. The presence of numerous links to disposable domains, as flagged by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, further supports a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing campaign.

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://botokaw.ru/123?utm_term=adobe+photoshop+7.+0+setup+free++softonic
    • http://xojuxelase.medianewsonline.com/nusebezusaletoz.pdf
    • http://sirosin.iblogger.org/93164608621.pdf
    • http://mokugujumekov.sportsontheweb.net/28030803521.pdf
    • http://pinipuvazus.22web.org/agenda_templates_for_meetings_free.pdf
    • http://mejuzuw.scienceontheweb.net/jalaro.pdf
    • http://tufepuwaw.iblogger.org/92254283669.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vudatuvabejosix.epizy.com/devupifasovagoda.pdf
    • http://mugazukadum.onlinewebshop.net/asma_gpc.pdf
    • https://uploads.strikinglycdn.com/files/03cc4879-5aa8-4516-bfe8-80eff1cebafc/76196151707.pdf
    • http://nogapovo.rf.gd/simple_english_grammar_notes.pdf
    • http://tidovikuvam.epizy.com/kitemokejapuwelunaxobaro.pdf
    • https://uploads.strikinglycdn.com/files/f73c4586-12e1-4e62-a3c6-447d46274d61/68990742901.pdf
    • http://tamugaza.rf.gd/co_operative_housing_society_bye_laws_in_marathi.pdf
    • http://sodukemesi.rf.gd/56113930161.pdf
    • http://warufadul.rf.gd/jisixanugekuzozaj.pdf
    • http://wugetad.myartsonline.com/is_mercedes_gls_reliable.pdf
    • http://rixupod.rf.gd/77479194697.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ce.bin
35dc74ebc20c126d48c23b6ff49860855acbb5310c385202a1a6edffaa4855b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CE 5384 bytes
font_01_sfnt_off0001082a.bin
373ab99481547fee4e7675754a171e2d44f440cc62812218a20abff4863c9b38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1082A 10940 bytes

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