Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d0809957161f17e…

MALICIOUS

PDF

76.3 KB Created: 2021-04-15 05:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b48e7adda2e959d53afe67bbb9aac7ea SHA-1: 89af3da5b924fd2721d8792e722fc3e720284685 SHA-256: 7d0809957161f17e336261e083408dfd2144094ad925994c22a9cb9bd2b58526
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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. 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 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://jottigo.ru/strik?utm_term=biochemistry+questions+and+answers+on+amino+acids PDF link annotation
    • https://cdn.sqhk.co/xalibolopov/idwugiQ/emergency_calls_only_samsung_s8.pdfIn PDF document text
    • https://sixagezox.weebly.com/uploads/1/3/1/6/131606695/fef3660da1bc10.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/cge8Hia/drill_master_polisher_waxer.pdfIn PDF document text
    • https://gikeviviku.weebly.com/uploads/1/3/4/7/134707445/9486578.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/1e0s4ge/jaligufex.pdfIn PDF document text
    • https://jopixedojowagi.weebly.com/uploads/1/3/4/8/134852439/detodumik_fufimirenadawo_mowabofom_nagevimij.pdfIn PDF document text
    • https://cdn.sqhk.co/jokawefezo/5haQig4/multicraft_free_play.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409394/normal_600e7dbdd1226.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500417/normal_6061454f34d7e.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/bRjjgc5/danepolo.pdfIn PDF document text
    • https://xojujafu.weebly.com/uploads/1/3/4/6/134633902/e9e6e00.pdfIn PDF document text
    • https://fexalikinuzumow.weebly.com/uploads/1/3/5/3/135324316/f16845f0d6c.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/d685e351-8115-4077-8ebd-26bdc6c368ca/kobalt_30_gallon_air_compressor_2_hp.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/calculus_12_textbook_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abab2b7a-670e-4d1d-8c70-3a863a1a40ad/honda_hcf-2_compatibility.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/how_to_use_noco_genius_gb70.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80785b5a-8b7e-4932-a52a-fc9577ba660f/41745434558.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/672f0ece-943b-4fb5-a1cc-537432162988/how_to_reset_one_touch_ultra_easy.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_off0000ede1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE1 5516 bytes
SHA-256: 19057b15455fd776e0c9801be401a72ae678915b8e5f6c74668c59deb7e815de
font_01_sfnt_off0001008b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008B 10244 bytes
SHA-256: 1fbfc30790360f099b5ab5c3b6db114135ebbdba02704ef1c04a1674b2bb9b9b

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