Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5345b407dc1584…

MALICIOUS

PDF

77.0 KB Created: 2021-04-04 05:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 936d966ba853a08b08611b07e0f08d99 SHA-1: 08a50aaf55bc940b254678b23da988cc22b3b061 SHA-256: 0b5345b407dc1584578dc20d58b52c602a0765e7f9ecb4c952c9dab8d6d34890
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of an SEO link farm designed to redirect users. The primary malicious URL identified is a redirector that appears to be part of a phishing or scam operation, likely attempting to trick users into believing they are viewing a product listing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://maypoin.ru/strik?utm_term=adt+scw9057g-433+battery+for+security+alarm+panel PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449177/normal_60579d969706f.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/7Xhfha8/formula_1_qualifying_live.pdfIn PDF document text
    • https://cdn.sqhk.co/winudesuw/cf3hiTO/celebrity_millennium_cruise_ship_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/fomudidira/ggdhjAI/virugetajigezirororopopib.pdfIn PDF document text
    • https://cdn.sqhk.co/numiwuzuwix/ieicwia/zeforajetivezewiv.pdfIn PDF document text
    • https://cdn.sqhk.co/bemoranoz/iahcjdh/draw_duel_hack_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/gcJjj7i/frogger_2_ps4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369509/normal_600db47fab599.pdfIn PDF document text
    • https://cdn.sqhk.co/fakujodi/jN0rDcZ/bubble_shooter_2020_game.pdfIn PDF document text
    • https://cdn.sqhk.co/tagisaxozof/jhfHnig/62162571829.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5d998483-9b36-4c87-a5aa-e74177011c2d/drum_beats_hip_hop.pdfIn PDF document text
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_579257c7cfbd4488a0554d25159efa23.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cfb13cd-553a-4237-b65a-fda014ef47d7/best_criminal_attorneys_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32c6f05f-dffe-4a73-925e-a9485f9e0814/26414419906.pdfIn PDF document text
    • https://0f3c41ac-de96-4ba7-a517-026d7435d592.filesusr.com/ugd/8631de_2e284f90a9984fb281ebca0f060ea270.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b48d4b9-6832-48cc-8151-591bfa33a9ea/88871991482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/943b3b87-25c2-47a9-a1f2-20b20d7e470b/jinaruzemojajetalaxofo.pdfIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_c811f9de580b4782bd95116205e025f8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3688e4ac-27ab-4584-aec8-792fa579de8a/why_doesnt_my_ue_megaboom_charge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c69971c-fe76-4736-a358-f291b972595e/17855627345.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7322e8b2-fc52-4f84-94f0-677b0caed536/jusewutabijunagu.pdfIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_f6e2df054c5c4e9084f227c22eee7eac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/678cb07f-3972-4d3a-a0f7-147f63a8e6b6/traductor_espaol_a_latin_antiguo_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0c7d8f9-e247-4412-891c-a20ad10e3e3c/53197635140.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD2 6464 bytes
SHA-256: 594b30401525cc1cd87b0247ea51d76c53e11a5a2d4193ec06432512d23456f9
font_01_sfnt_off0000f1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CE 11092 bytes
SHA-256: 70447825945e50c5abeead0887f1511d5cd2c1a109f2d55b9dd2535a19750e50
font_02_sfnt_off0001178a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178A 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230