Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c759196a9e46522…

MALICIOUS

PDF

65.1 KB Created: 2021-02-05 09:19:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 7fe544ccdcaa86a5ae367473b767442a SHA-1: 16ad5f9e66a28cc1377afc05c93ecc05d3c51047 SHA-256: 3c759196a9e46522597d5ee72bb35bca32d3a2bb715483d07abe9e3fb356a8d2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://bologen.ru/123?utm_term=rab+ne+bana+di+jodi+full+movie+in+tamil PDF link annotation
    • https://jeboxuxu.weebly.com/uploads/1/3/2/7/132710743/5667441.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/9jggjgd/polaroid_originals_onestep_plus_vs_onestep_2.pdfIn PDF document text
    • https://viwoxinuzozaxa.weebly.com/uploads/1/3/1/6/131636825/kovebasoparu.pdfIn PDF document text
    • https://wizujepubenepax.weebly.com/uploads/1/3/5/3/135317151/joxajibovadope.pdfIn PDF document text
    • https://rofixuninapo.weebly.com/uploads/1/3/5/3/135313709/8382000.pdfIn PDF document text
    • https://jirogadipew.weebly.com/uploads/1/3/1/6/131606393/wetivej-foluz.pdfIn PDF document text
    • https://cdn.sqhk.co/kupulifip/hhjjcDI/xbox_series_x_black_friday_price_2020.pdfIn PDF document text
    • https://wolofineso.weebly.com/uploads/1/3/4/5/134598063/1435333.pdfIn PDF document text
    • https://jinimajaloxole.weebly.com/uploads/1/3/5/3/135314869/8672978.pdfIn PDF document text
    • https://cdn.sqhk.co/tadanopi/fhgjgic/lap_timer_for_mini_4wd_slot_cars.pdfIn PDF document text
    • https://cdn.sqhk.co/difanemifal/5xkhcQ8/58114278934.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://virefixifefuke.epizy.com/gallery_lock_apps_com.pdfIn PDF document text
    • http://gerodusiwisegog.rf.gd/conjunctive_adverb_exercises.pdfIn PDF document text
    • http://nerokigonone.rf.gd/street_fighter_97_free.pdfIn PDF document text
    • http://mapulikilep.epizy.com/best_completely_free_vpn_for_android.pdfIn PDF document text
    • http://biborufa.epizy.com/gebefuzabo.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_off0000c2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A0 5064 bytes
SHA-256: fed3102b8e132fe1df81ccc71ccc80011d50220c5e0474687dec7eaaa71731c8
font_01_sfnt_off0000d3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DF 10460 bytes
SHA-256: 32645b632c0e348cdb905856feb2bffd811e7a61a9db45f37dd5524814925bad

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