Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8656ebb3221006…

MALICIOUS

PDF

80.7 KB Created: 2021-04-04 20:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17813d85cf0b782e6c7f633729e0ee7e SHA-1: db7d933535e9a6eeef1e51f74ace3daf69c2dc0c SHA-256: 8b8656ebb32210060b23b9f47a5bfbf754a8acbb6f0c7c4487e57375c9742948
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation designed to redirect users to potentially malicious content. The embedded URLs and the overall structure strongly suggest an attempt to manipulate search engine rankings or trick users into visiting harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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 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://dugedepap.ru/strik?utm_term=journey+to+the+west+1996+theme+song+lyrics
    • http://arm-watch1.club/us_passport_application_form_ds-_1155ije.pdf
    • http://bamuxawubukid.22web.org/duromax_12000_watt_hybrid_generator_reviews.pdf
    • http://natural-shop.info/ccrn_practice_questions4cqdx.pdf
    • https://cdn.sqhk.co/vajegipofuz/jd6gfja/walmart_neighborhood_market_springfield_mo_campbell.pdf
    • https://cdn.sqhk.co/leporolino/Iidhfq7/51828295153.pdf
    • http://erkutungotu.com/13331537798r8f1w.pdf
    • http://salearea.pro/355633392822i47x.pdf
    • http://exampl1214.com/ludakejezejit32c.pdf
    • http://wwwbcpzonasegura-viabcp.com/xutefinofajofegizugarmujw.pdf
    • http://prechambre.xyz/olympus_camedia_c-_5060_manualgh7ob.pdf
    • https://cdn.sqhk.co/kegufamop/1zicoih/dixudegelapal.pdf
    • http://lnstagram-copyright-supports.com/36179807583m07lj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://nowuzapifara.rf.gd/tanatologia_geriatria.pdf
    • http://jiwuwusa.epizy.com/assembly_language_step_by_step_programming_with_linux_3rd.pdf
    • https://ba9dc33f-61c2-415e-8598-c57272458a21.filesusr.com/ugd/c05727_a73b08a2498f48b08c9fb11bf9ece8de.pdf?index=true
    • https://8d275f60-8e36-4e70-8574-b6d542a617c4.filesusr.com/ugd/dbf6c2_2587910ea2424064a13a26048fa51743.pdf?index=true
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_585c2e583a22496bb8676a780b56c775.pdf?index=true
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_9d477bf2b2a1474a8afb6817f72a9a11.pdf?index=true
    • https://52a1af19-6946-4c37-aba6-ab00a30e4874.filesusr.com/ugd/5dc3ca_b8d3a95cd98445f9844a7ab680ab9ac0.pdf?index=true
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_dc7e7592ab77450f99ae00c4f247e75d.pdf?index=true
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_311f496efeea45d7bd177894121b2702.pdf?index=true
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_bf615146d303472580630b1854edc347.pdf?index=true
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_68bb17e5af8943be874561bc03d33a0f.pdf?index=true
    • http://kafopazam.epizy.com/cover_letter_format_for_school_admission.pdf
    • https://178fd8f3-986e-459b-a431-83c1f58eadb8.filesusr.com/ugd/7a8e82_ae457929af404c66990b96147902762b.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd1.bin
3f86cd9643d18f628a61111f0727db86acdf0986dd959d4ca6cd80e4d86dc183
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 5428 bytes
font_01_sfnt_off00010034.bin
8e85ddf12bdd22ec3bd992260cef732415bf9c7abfd75c529b3533ed33fe0760
pdf-font-stream PDF embedded font (sfnt) at offset 0x10034 11328 bytes
font_02_sfnt_off000126b7.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x126B7 4324 bytes