Malicious PDF — malware analysis report

Static analysis result for SHA-256 e578a8888982d484…

MALICIOUS

PDF

95.9 KB Created: 2021-03-29 07:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 1f9b64c32a1bc58f451db4384211bd95 SHA-1: bb8d00f0bcf58bc3b9085174f4e28a847cd827b7 SHA-256: e578a8888982d48481ead24166e6abf9fca440472467343afa2aa4d838f9de45
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and heuristics point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://maypoin.ru/123?utm_term=avatar+movie++in+tamil+bluray PDF link annotation
    • http://duplicwcnj.space/sharp_portable_air_conditioner_model_cv-p10mc4b1j6.pdfIn PDF document text
    • http://bodyita.space/model_3_standard_range_upgrade06zs5.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/oVjeyRI/lavedisi.pdfIn PDF document text
    • http://vajogeboru.iblogger.org/gamofesatomejadatulipin.pdfIn PDF document text
    • https://cdn.sqhk.co/wanoposuj/Sbiijjv/feropevugopef.pdfIn PDF document text
    • https://varusotefus.weebly.com/uploads/1/3/1/3/131398431/a42aeefe2.pdfIn PDF document text
    • http://bigmagazin.xyz/74686209973ju1id.pdfIn PDF document text
    • https://mibuxinuk.weebly.com/uploads/1/3/4/7/134753888/zanuzejovaxoga.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/iJ26rhb/vabaxesalad.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/ccd4b122-b3f1-468b-ba1b-704e2959bb46/kenmore_600s_washer_lid_lock_bypass.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/871e5fe3-3da6-4d3d-9359-37b42b82b8fc/84211317909.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e96cd0f-89f1-4421-9a53-fd14f21f2d4a/kazozanalipokibexijofusik.pdfIn PDF document text
    • http://fujimuwudoketiw.rf.gd/pdf_meteorology_and_climatology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd9099b6-a7f0-4114-bebd-e5ff12f9a048/semi_log_graph_paper_for_sieve_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cce53537-96d8-42f2-adf2-adc383a36f7f/63019529078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c74f4a1e-4357-4f14-ad62-7b85048d8c1f/are_ride_on_mowers_worth_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae4e81d8-54a0-44cd-b5f3-36b9028dab1a/67155785592.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_off00012e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8E 2912 bytes
SHA-256: f725b616a1add9e943c6eb4fb6e7c9f4993d2e6aee03ef0522a7e9ab2836f318
font_01_sfnt_off000138e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E9 4944 bytes
SHA-256: 0fbac95f8ecd180e5b0610794d8e19ca365d1e93d00a8155fea19110dd3e1b75
font_02_sfnt_off000149b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B1 11924 bytes
SHA-256: e8e84fe5743d66c280da12293ea7666dd235fb46b8af905c5ca9de617e05792c

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