Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3256c2eeb3a3e9a…

MALICIOUS

PDF

75.8 KB Created: 2021-04-08 02:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 912c07c4401b19a1eac9d333d6462c2d SHA-1: 1fec0fc637f98fe3bd50b887aa045992a1cbd075 SHA-256: a3256c2eeb3a3e9a622d595a1ea089f1bd661b434b763ca79cc9e7f7cecd71cb
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 0.9993

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://nipisod.ru/123?utm_term=galarian+forms+trailer PDF link annotation
    • https://cdn.sqhk.co/kukilapi/iegfgdL/45370901063.pdfIn PDF document text
    • https://cdn.sqhk.co/nizekidido/Zjh20hb/tarujojutopirep.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/lZhiaia/supepigabakubuxomeborisu.pdfIn PDF document text
    • https://pusuranan.weebly.com/uploads/1/3/4/5/134598414/rigurejawoj.pdfIn PDF document text
    • http://dasezin.getenjoyment.net/anesthsie_pridurale.pdfIn PDF document text
    • https://gokejubekilebu.weebly.com/uploads/1/3/4/3/134376129/xugimedagikup_kisexo_xobimutalu_bimiz.pdfIn PDF document text
    • https://domazatavaxagit.weebly.com/uploads/1/3/0/7/130775902/781f5d653cc.pdfIn PDF document text
    • https://tokemenar.weebly.com/uploads/1/3/4/3/134337898/6782600.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/ebjbha1/sushi_hachi_dc_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/wowixepis/ifjahjK/crossword_puzzle_maker_free_with_answer_key.pdfIn PDF document text
    • http://xugaguf.mypressonline.com/encyclopaedia_universalis.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/fhdieoq/gem_prospecting_in_washington_state.pdfIn PDF document text
    • https://cdn.sqhk.co/gunakawujo/FjiHwhf/vavejixen.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/jIhdmjd/s._u._p._e._r_super_defenders.pdfIn PDF document text
    • https://famutogerene.weebly.com/uploads/1/3/4/6/134688643/362bf8.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/hard_sat_reading_passages.pdfIn PDF document text
    • http://dinewegivogofe.mygamesonline.org/4587936950.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CsqibHb/duzibadufefubonatamarukez.pdfIn PDF document text
    • http://fejukoturig.medianewsonline.com/cyrano_de_bergerac_quotes_francais.pdfIn PDF document text
    • https://cdn.sqhk.co/pojuzijix/iagjhiJ/snake_puzzle_game.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/a613db4a-80df-4fd5-8923-91d2f5e9b54e/34874983898.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/020d6d61-0ca9-4623-a19a-01633236dc4c/fuxaxew.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_off0000ed6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6D 4944 bytes
SHA-256: bb690632ac88982f6ba2b052c5d64e7cff2945764e4708355b90f871766e67b7
font_01_sfnt_off0000fe2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2B 10648 bytes
SHA-256: 987786baa963e225c5e4e3256823fa1ec7ee3e06140dbd0a2586f6b4c7b55fcc

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