Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b42c0d7caf5d6a…

MALICIOUS

PDF

100.6 KB Created: 2021-06-11 19:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8fcf57c50e9022cc46cbd6687573dd23 SHA-1: 1bf9000d4cb151ad2517e299a96a1db5b9b186db SHA-256: d2b42c0d7caf5d6a9ebb6ddc5bda58a2df98ba4fc0464a2bc85c2b6c8f9e59c1
206 Risk Score

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. It uses a callback-phone (TOAD) lure. 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 7

  • 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.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://smidgel.ru/pbw?utm_term=lg+revere+vn150+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419818/normal_603175983460f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485818/normal_6062c60f75165.pdfIn PDF document text
    • https://zikagedatudupoz.weebly.com/uploads/1/3/4/2/134266226/juzadupadikag_sajemizup_kewejagopi_bixupodeki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484805/normal_5fdd221b3189d.pdfIn PDF document text
    • https://kifowufowuvix.weebly.com/uploads/1/3/5/3/135392599/f422c1.pdfIn PDF document text
    • https://kelukija.weebly.com/uploads/1/3/4/3/134337818/30a3d4ee077210.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404490/normal_6048e0c89ea00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496815/normal_6047d06cec090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401723/normal_60259019205de.pdfIn PDF document text
    • https://dexajuvado.weebly.com/uploads/1/3/4/4/134470202/zusujaparike_bupona_guroxo_wapotukimeguga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/46d48fe4-0ddc-43b9-8444-76fc2243158b/late_night_bars_atlanta_sunday.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/019bbe8a-4d23-417e-8e8e-dc427f71b0c4/24567833622.pdfIn PDF document text
    • http://fuzugimife.pbworks.com/w/file/fetch/144994119/zonudidevozazisuratovi.pdfIn PDF document text
    • http://juzifezazuk.pbworks.com/f/great_gatsby_study_guide_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf0e2460-b5e5-4829-81bd-4502701a87fe/el_rinoceronte_de_ionesco_sinopsis.pdfIn PDF document text
    • http://kefimazusob.pbworks.com/f/rujuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88dd14da-191f-48e0-bc7e-b28b03055590/momolijetixobikefoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa48694e-856b-4238-8756-188a932ca371/65318597787.pdfIn PDF document text
    • http://zefuberiwuli.pbworks.com/w/file/fetch/144844968/how_to_remove_economy_7_heaters.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_off00014b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B5D 5144 bytes
SHA-256: aaf11346fbe504ee1fe0def916f01f532a05f167288b275d5c4a4c9e8c4e78f3
font_01_sfnt_off00015cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CDE 12092 bytes
SHA-256: 3a7090b90ca2bcf50d84ad001ffffbe5603d4876d10d17e17e6b6ed366341fd1