Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c1d05c997fb080…

MALICIOUS

PDF

72.4 KB Created: 2021-02-15 08:03:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 387057baef5cd16ac71b5065c6c528b5 SHA-1: 0aba2aeeb81c07ed7e198086662d9fde504bf9d7 SHA-256: c7c1d05c997fb080599d80e68d6b8984ac175bfb1ce1e00b2c055c74c709b04a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

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://maypoin.ru/123?utm_term=granite+construction+financial+statements PDF link annotation
    • http://sodamasagu.66ghz.com/book_mockup_file_free.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/ihbhfii/dragon_warrior_1_nes_items.pdfIn PDF document text
    • https://sobasoje.weebly.com/uploads/1/3/2/6/132695832/6653297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_601eacda05d53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480580/normal_5fe68cd5601f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459774/normal_6020b9c04f87a.pdfIn PDF document text
    • https://cdn.sqhk.co/roratumopiv/xwL3jak/vuvisuto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411932/normal_5fc9e5a54d2ba.pdfIn PDF document text
    • https://tiwixuferexo.weebly.com/uploads/1/3/1/3/131380596/nuguro_xonafotefavabo.pdfIn PDF document text
    • https://cdn.sqhk.co/jisogixij/ligh0jg/amazon_photos_family_vault_invite.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/cp8ijgj/the_apache_tribe_facts.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ramapenutizawa.epizy.com/libefutixejurebipel.pdfIn PDF document text
    • http://karimelu.rf.gd/zinagopul.pdfIn PDF document text
    • http://puwukuju.epizy.com/kasen.pdfIn PDF document text
    • http://zelekisiwamab.rf.gd/still_hillsong_united_piano_sheet_music.pdfIn PDF document text
    • http://pesufebavarobi.rf.gd/meri_bamani_garhwali_song_lyrics.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12E 5056 bytes
SHA-256: 0853d518c907efc753e3e09f5f4e0a20b49a0a2538e7f838f9942347d833dff0
font_01_sfnt_off0000f24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 10004 bytes
SHA-256: 001c7c512b8dd9d19ca6ec11c0177fdaeac87fbeab1c6ba5010ef7ef378bd3cd

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