Malicious PDF — malware analysis report

Static analysis result for SHA-256 989604561418ca82…

MALICIOUS

PDF

86.2 KB Created: 2021-03-09 03:29:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9ef5fe6d4a1bbfe1fa4698491a1f785f SHA-1: 200a27201770895fbe0f16c179652680d6863e6d SHA-256: 989604561418ca827f753a0cc467ea69d4dd48bb99178c4eda0593700fb81892
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/award?keyword=bowlby+theory+of+attachment+pdf PDF link annotation
    • http://igcopyrightforhelps.com/6214005191sfywf.pdfIn PDF document text
    • http://neip-forum.fun/fedapirirukox0u8ch.pdfIn PDF document text
    • https://cdn.sqhk.co/kokedipemi/ikjgiff/dwight_schrute_acting_manager.pdfIn PDF document text
    • http://fherixq.com/57467239041jrrii.pdfIn PDF document text
    • https://cdn.sqhk.co/gosukutusu/iiifkgc/wba_stock_price_forecast.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/eAejzia/ms_pac_man_tv_game_instructions.pdfIn PDF document text
    • https://pusifife.weebly.com/uploads/1/3/1/4/131407530/2919124.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/BhigdR3/52206997718.pdfIn PDF document text
    • https://tabutepapuwup.weebly.com/uploads/1/3/0/7/130740025/pigutob_kupoza_fesorabokun_wumuvog.pdfIn PDF document text
    • https://cdn.sqhk.co/vewukiziwemi/RYOVjhD/soxudukawovidefed.pdfIn PDF document text
    • http://potolkilife.ru/gpif_japan_annual_report2md10.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/26e2884a-d1e8-4df7-8325-8ff49734f14b/rafekevirotulirezudisin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5680ea10-2943-422b-b4f9-2743bb5b7f39/the_selection_summary_book_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a069ba15-8cfc-4288-b5ec-325c14c99acc/voicelive_play_tc_helicon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d91a1eb9-fce3-409f-a651-d31859d5fc19/bitutovujis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30bec425-5a74-4c9e-bf98-ddc5215bbc8f/88353044805.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_off00011531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11531 5600 bytes
SHA-256: 8a580092474a6100a288a943a63c6a88aaf7000f96256ae0f479de1c0d1be7a5
font_01_sfnt_off0001281e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281E 10548 bytes
SHA-256: 58485b78475e5889306695a6cc44c875079890fa676cc10feb59cb34d6decafc

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