Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a929c200bcc3fb0…

MALICIOUS

PDF

77.6 KB Created: 2021-04-07 21:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2ea9dc45e5e77acbde16f4527aa1618a SHA-1: 53f3d577d5c4e8f2db213356fe36b341177ffa92 SHA-256: 7a929c200bcc3fb0879e331b125c1a9205ec6e7f1a9d5ebc16d692c36d439221
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains multiple heuristics indicating malicious intent, including ML classification, security bypass instructions, and a password archive lure. The embedded URL 'https://crophysi.ru/strik?utm_term=download+nitro+pro+9+full+crack+gratis' suggests a phishing attempt for software cracks. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, aligning with the file's metadata. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/strik?utm_term=download+nitro+pro+9+full+crack+gratis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409798/normal_6041090893569.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/duijaMW/sculpture_garden_nj_rat_s_restaurant.pdfIn PDF document text
    • https://cdn.sqhk.co/gogoturowib/jfFZWgh/best_songs_of_john_farnham.pdfIn PDF document text
    • http://mugukix.mygamesonline.org/statistical_rethinking_a_bayesian.pdfIn PDF document text
    • https://cdn.sqhk.co/lebapivi/Bji1Euf/kart_racing_helmet_camera.pdfIn PDF document text
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/xeminesexuzijowe.pdfIn PDF document text
    • https://rewazute.weebly.com/uploads/1/3/4/6/134648352/zuzugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412396/normal_606a8f864c273.pdfIn PDF document text
    • https://cdn.sqhk.co/mokopizel/gchagjh/fuwuvuronejefasoda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529780/normal_6021725f386cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491155/normal_60289045eb003.pdfIn PDF document text
    • http://kimiter.medianewsonline.com/aleksandrova_tehnika.pdfIn PDF document text
    • http://pasiworuwiwoz.getenjoyment.net/ginozataledumopibuvogimat.pdfIn PDF document text
    • https://kinixudowobi.weebly.com/uploads/1/3/5/3/135399761/wikuxuzap-sufurusuxixoti-nitowubaxu.pdfIn PDF document text
    • http://jugepawe.medianewsonline.com/temezumiwodijixaponevuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rodedewezijore.atwebpages.com/threats_to_validity_and_reliability.pdfIn PDF document text
    • http://bitines.myartsonline.com/javascript_programmers_reference.pdfIn PDF document text
    • http://bopewexe.onlinewebshop.net/automobile_engineering_basics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9051273b-caef-4869-9786-5251b5b2ac11/dagevogero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bf2be54-810e-4b07-b86c-9ab9b2f04a99/pubiminamexuwamisos.pdfIn PDF document text
    • http://fatavetotujel.onlinewebshop.net/zopepinonewimaxafoxivuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2240042-e298-43c2-b36e-8c29ca447bb1/grammaire_mthodique_du_franais_gratuit.pdfIn PDF document text
    • http://tonavisuma.onlinewebshop.net/96046061487.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_off0000ebaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 5636 bytes
SHA-256: 353d9c94b35d12249a47f2e32451d9344009b3b3d1d6877889f75e8f0ddc47a2
font_01_sfnt_off0000ff08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF08 11948 bytes
SHA-256: 5c9f49ef209f656bb9a046d2f4acb634586f06627b33193387208e2ed4b1e8e8