Malicious PDF — malware analysis report

Static analysis result for SHA-256 8655c7c588822ff8…

MALICIOUS

PDF

80.3 KB Created: 2021-03-29 07:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e38782c8cdd116efea53192659c759db SHA-1: 97a72f07c5b682be48b7fdd0b72de176f492653a SHA-256: 8655c7c588822ff8302e814aeca3eca29c4932ee2991dc408cc2fa293e2a65c9
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm or SEO abuse tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates redirection to potentially malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=computer+hardware+engineer+salary+per+month+in+dubai
    • http://myfirstsite.xyz/fapisekivisonow4c4t.pdf
    • https://cdn.sqhk.co/nazopekujavi/jdyjbjd/fruit_cute_drawings.pdf
    • http://sodaapp.pro/polder_food_scale_change_to_gramsw92j3.pdf
    • https://penonogam.weebly.com/uploads/1/3/4/0/134012545/dajosujugex.pdf
    • https://jurajewokikum.weebly.com/uploads/1/3/5/3/135349146/tusugusotufi_mobiw.pdf
    • https://cdn.sqhk.co/rarukaboz/Zhfpuev/cake_decorated_with_candy.pdf
    • https://sifajovu.weebly.com/uploads/1/3/4/8/134874608/jususaxajamojul.pdf
    • http://cetop.xyz/mcgraw_hill_education_workbook_answers_spanishj0y6u.pdf
    • https://tirilume.weebly.com/uploads/1/3/4/8/134886795/16fc22da.pdf
    • https://cdn.sqhk.co/wufotubi/MgjjbOb/king_herod_bible.pdf
    • https://cdn.sqhk.co/jogujufuza/eta5ijv/big_head_soccer_unblocked.pdf
    • https://karujelibofab.weebly.com/uploads/1/3/1/4/131406149/446479f4e40.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c38d9960-f3a4-46a0-b266-cfc7836dd0ed.filesusr.com/ugd/a8d9c8_24fc735b874d4913a0419756478d12b3.pdf?index=true
    • https://s3.amazonaws.com/xupizewuxere/padoliwunefik.pdf
    • https://s3.amazonaws.com/kigavanus/lojibewagasuvo.pdf
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_30feb533c6b342feb164eb7ce3f969c2.pdf?index=true
    • https://00e6f838-d17c-4130-b616-1adf5f4d9bb3.filesusr.com/ugd/714321_a6bcdf6fabb740fcb279880a3485d379.pdf?index=true
    • https://f6142301-0c02-44dd-b2c5-62cf9b3cd0dc.filesusr.com/ugd/ebfdba_a92ab6226916424589bac411b53ffbcb.pdf?index=true
    • https://s3.amazonaws.com/pibajuwi/19245078612.pdf
    • https://s3.amazonaws.com/setaxilitozuko/asura_arasan_hollywood_movie_in_tamil.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ef.bin
f2c68e47a5ed45e6e666fea4f42268062b9652871551fd7df2f5c5a57497ef54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EF 5612 bytes
font_01_sfnt_off0000f5e5.bin
2b4e8fcff97e32a4ebf137f4c970191d0fc3376d7d5478516b3d18790e3cd79a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 10940 bytes
font_02_sfnt_off00011b50.bin
abfd1a4e08dfe830f6ecbe71d4a08834f734cd5697ae7c37078be791afbc0871		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B50 16256 bytes

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