Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c8afdde8312ef6…

MALICIOUS

PDF

82.8 KB Created: 2021-03-23 02:06:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4bd17788c40bbc4b5f15dd46f39a69ee SHA-1: 88e0e18d818b5d13766dc77b61a0cf70fb1a1986 SHA-256: 71c8afdde8312ef694bb698ef1ae2847c73e99f5a7d66b8066e4daa6c9636739
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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://lozipotod.ru/aws?utm_term=time+enough+for+love+heinlein+review PDF link annotation
    • http://twobigs.space/pagukizalabuvuc4gew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499984/normal_5fcb150504ef6.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/ggg6Y6R/xosogoribapililapike.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409092/normal_5fe05d4ed0fcc.pdfIn PDF document text
    • https://cdn.sqhk.co/wavafinudow/QFliiih/azur_lane_jp_apk_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407983/normal_6031ef6011396.pdfIn PDF document text
    • http://znakomstva69.space/what_is_the_best_electric_type_in_pokemon_sword19866.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366389/normal_5ff65a92383a5.pdfIn PDF document text
    • http://ourfutures.space/podowozetevulereweyhwx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369779/normal_6028b7932b6fb.pdfIn PDF document text
    • http://begdas.fun/the_unwanteds_book_7_read_online_freek9dnj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392457/normal_605447ef62a60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370764/normal_5ffd714fedf40.pdfIn PDF document text
    • http://baltika-trans.ru/608683428605i4h4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_facc99e10a1e4f5785f5f57aa39cf3d2.pdf?index=trueIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_a24acfaa7abb40c5a96eb3e901c007fe.pdf?index=trueIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_b2fa7b39bcbf4921a133b00a5ec89c96.pdf?index=trueIn PDF document text
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_bfac947c4cbf4eec94b61fd99f81713b.pdf?index=trueIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_4c0b03cbf8e84562b324af0f2c55159e.pdf?index=trueIn PDF document text
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_8809fdebd52d4f8483f172c444625749.pdf?index=trueIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_5c1193f59cb04a87bbeaeac1522daa02.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFD 4696 bytes
SHA-256: e3cee3ad5ffb0cd8a31d1c465201d0d3fbc4cc9aa95b8590e8badc1368bc6702
font_01_sfnt_off00010acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACC 10868 bytes
SHA-256: 1f51b6dfa6f3ada28825711474145168fc8fbaf26e8ef8c8a223d099bb2e5564
font_02_sfnt_off00012fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB0 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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