Malicious PDF — malware analysis report

Static analysis result for SHA-256 253ae9021f5edada…

MALICIOUS

PDF

77.1 KB Created: 2021-04-17 17:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fdf7d4c9801b627fa17b49b1bcba556b SHA-1: 2c6aa377ef8f7a8c3e14a349bb382ce2f7770db0 SHA-256: 253ae9021f5edada35cb480f2e2c86933f03f1b6a413d9fb95eb4524a0b99464
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and utilize UTM parameters, indicating a phishing or spam campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to redirect users. The ML classifier and ClamAV detection confirm the malicious nature of the PDF, likely serving as a lure for further malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jottigo.ru/strik?utm_term=run+less+run+faster+free+pdf+download PDF link annotation
    • https://cdn.sqhk.co/fomeluxilim/w2jgzII/68859029275.pdfIn PDF document text
    • http://tokio-2020.fun/why_are_my_labels_printing_blankyia6k.pdfIn PDF document text
    • http://ninuxalezopo.getenjoyment.net/tejiniwepajudalap.pdfIn PDF document text
    • http://fixadazopirutus.22web.org/72103084612.pdfIn PDF document text
    • https://cdn.sqhk.co/sakupiraf/dxjdWTf/bowl_synonym_starting_with_e.pdfIn PDF document text
    • http://mogoxopedutisaw.iblogger.org/tuxibumewepapafaso.pdfIn PDF document text
    • http://pagipuniluti.iblogger.org/figigedakizadezitutuzime.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/igy2jec/19446184392.pdfIn PDF document text
    • http://gapilojazixo.getenjoyment.net/98598951985.pdfIn PDF document text
    • https://cdn.sqhk.co/malofavu/lNjb5Sx/s._o._s_emergencias_medicas_srl_obera_misiones.pdfIn PDF document text
    • http://itwomen.space/jamogifokunigaoxyfg.pdfIn PDF document text
    • http://novubelugalij.medianewsonline.com/63531754794.pdfIn PDF document text
    • http://subexadedesu.iblogger.org/atmosfera_geografia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wakafovoda.epizy.com/benedict_cumberbatch_sherlock_holmes.pdfIn PDF document text
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_d0bc5fc30c994db38cf8015e156e76d1.pdf?index=trueIn PDF document text
    • https://9c33b4df-6f14-41ad-9e94-a3a23f7ed20d.filesusr.com/ugd/2a975f_e71acfc2bbcb4f3ca1a4f9f1e2c5b5a3.pdf?index=trueIn PDF document text
    • http://mujotipaxoxi.epizy.com/analogy_worksheet_2_answer_key.pdfIn PDF document text
    • http://kudadurazeze.rf.gd/vasuregefivalipejuduv.pdfIn PDF document text
    • http://jomobagezib.rf.gd/jurnal_teori_pembelajaran_behaviorisme.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_off0000f11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11A 5136 bytes
SHA-256: 80824ce90682446f7fe1b6ada279eb00fe39fe606857dd722c4ca8c868094445
font_01_sfnt_off000102b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B7 10728 bytes
SHA-256: 725bb1ad4f81ac3ef18ed57eebf19df79496b89befcd77b4df654b11ab1ff06c

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