Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb234bb4aec8878…

MALICIOUS

PDF

84.2 KB Created: 2021-03-14 05:34:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8847e5d128335ff8ace4f0c849def708 SHA-1: 5a01c7e3d7058dc351990a0939094bbae126ce7b SHA-256: ffb234bb4aec8878a042c61a975990f8cc8ecd1ae098779d6b008c51270b9519
186 Risk Score

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 0.9995

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://xajibur.ru/123?utm_term=incorrect+balance+on+credit+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482189/normal_5fe78038195da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474475/normal_5fd6526731802.pdfIn PDF document text
    • http://ita-yog.space/war_of_1812_apushnz83m.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/gejhUQH/pokemon_sword_and_shield_guide_book_download.pdfIn PDF document text
    • http://cancandance.org/jcpenney_sewing_machine_model_7050_partssl7wu.pdfIn PDF document text
    • http://iciapp.xyz/vivah_biodata_format_in_english5ivuq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468540/normal_6029c3ac05bb2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410962/normal_60089a9be2dfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427538/normal_604af7dee04dd.pdfIn PDF document text
    • https://cdn.sqhk.co/tesinogopano/ZEje0Js/1551190310.pdfIn PDF document text
    • http://fruits-summer.fun/castle_story_forum_forest_wispl0b4w.pdfIn PDF document text
    • http://runolive.com/sijoje90d1u.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/Hieowjj/shadow_fight_3_pc_gameplay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459636/normal_602795f7e6d34.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_3fe3175ed6454743af18ffdad6a4e089.pdf?index=trueIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_7cb10f84a35343238ac983ad6b237b73.pdf?index=trueIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_4d30ba437cf04445b5846597d97ae408.pdf?index=trueIn PDF document text
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_f90360c51480419d8e7e0a33abd7095f.pdf?index=trueIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_f960431d2fbe49ada7dc60814cfc4f76.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_ca17881cca1043aa8944d55dd37a4fec.pdf?index=trueIn PDF document text
    • https://7980b0ff-2efe-48f4-a442-6c87bca80713.filesusr.com/ugd/9bd8c3_d655c1cf09ec45329e2e25513a3e4851.pdf?index=trueIn PDF document text
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_0acd902b8a6248d4ac6e268d8abe1b75.pdf?index=trueIn 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_off00010ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCD 4964 bytes
SHA-256: 823f9b7046e3162457cbf30b030b643fb1109a3600bfe291f15dd92096e55291
font_01_sfnt_off00011db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB9 10964 bytes
SHA-256: f426f5efa981cedabdb1c390ddda765a1ae5960f3187fe6677f6017eaca462a3