Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0315a816447d5e5…

MALICIOUS

PDF

78.5 KB Created: 2021-03-23 21:34:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9559af51db1a0946d2dbb6911599186e SHA-1: c47837ff53b9d5813040e4908a6010314aa95cef SHA-256: c0315a816447d5e5211809d1f68c9fc1f03bd7cad4fb9a8640c2577ae6abafd2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are presented as download links for various items, including software and manuals. This suggests a phishing or malware distribution scheme, likely using a spearphishing attachment as the initial access vector. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://druttle.ru/award?keyword=anesthesia+basics+pdf+free+download PDF link annotation
    • http://opensalle.xyz/samsung_galaxy_tab_a_sm-t580_caselh9j7.pdfIn PDF document text
    • http://dressnbuy.com/vidoxovulawaviravfa2c3.pdfIn PDF document text
    • http://natfreshik.fun/adam_fawer_empati6mjt8.pdfIn PDF document text
    • http://regse.website/71909223918l8ise.pdfIn PDF document text
    • https://cdn.sqhk.co/daposofoxig/iP6Aqhe/bifezakupuzer.pdfIn PDF document text
    • https://cdn.sqhk.co/xaleteser/QhiZjc9/fafiwutuxabefesel.pdfIn PDF document text
    • http://store50off.info/tugavhipj7.pdfIn PDF document text
    • http://seamanygau.best/17851578269bqqle.pdfIn PDF document text
    • http://sevastopol.sale/64424472169h6jld.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_1dfcbfb19ad64c6d996add9da4b55e0b.pdf?index=trueIn PDF document text
    • https://a1d3e036-d9a1-4be1-9d2f-eedbb581cb22.filesusr.com/ugd/3ce946_8db63c2915af4374b626a0d5c9c392f9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6d34347-4c3b-4a36-af83-84dd40c68284/sears_snowblower_parts_manual.pdfIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_c00647c604d341119ec17eb72b2b7c17.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fa4c854-1143-4748-8df9-f39daba7517b/51544892034.pdfIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_007fed8e42c5429d88b2655f27c12bac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/liberalismo_caracteristicas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1890cfa6-2a70-4cf7-8fca-a9cb79d7287f/joy_luck_club_book_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/sazowo.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/66126422508.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABF 5464 bytes
SHA-256: 100f59a6f156199c4a3d17711db7da41ac8883b36477d91e607587a1c2f6c563
font_01_sfnt_off0000fd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD55 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off000105e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E3 11296 bytes
SHA-256: 62bcfbf8d44c2b354cd424eb80d9d1e75402a8882da7cf42b28ac333f577fce7

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