Malicious PDF — malware analysis report

Static analysis result for SHA-256 d194eb656d197250…

MALICIOUS

PDF

90.7 KB Created: 2021-03-29 01:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bba8da600b3b16f696aa66082e06516d SHA-1: 9b2b289b58ca0b6533b01dcd9198e83fce2d424d SHA-256: d194eb656d197250ae323f93373c5dd8ae773270063c8fb5e0338d9a10ec5941
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=riesgos+laborales+enfermeria+pdf
    • https://cdn.sqhk.co/duxadikoti/ckh8a5u/light_meter_app_iphone_review.pdf
    • https://cdn.sqhk.co/bikakigiben/qOTRQjg/falling_in_reverse_merch_amazon.pdf
    • https://jolexufawiro.weebly.com/uploads/1/3/4/5/134595506/rakobedi_tapuzerojujixi_kijediwojevat_nenapokufo.pdf
    • https://mojurakikaluno.weebly.com/uploads/1/3/1/4/131438245/8b902f55fff.pdf
    • https://cdn-cms.f-static.net/uploads/4382973/normal_5fd61218abfd1.pdf
    • https://duweliga.weebly.com/uploads/1/3/4/5/134593675/4aa0f.pdf
    • https://cdn-cms.f-static.net/uploads/4496602/normal_604fe3ad630db.pdf
    • https://taponoranasigem.weebly.com/uploads/1/3/4/6/134643922/adc36920398a07.pdf
    • https://cdn-cms.f-static.net/uploads/4369306/normal_600c1d25d808e.pdf
    • https://cdn.sqhk.co/wajerewuwer/hNjhb7k/58860597926.pdf
    • https://cdn.sqhk.co/pewowutefiw/1iajaii/breville_pizza_oven_pizzaiolo_sale.pdf
    • https://cdn.sqhk.co/nobipajami/iidgjgA/arena_cobra_goggles_junior.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_82405c4662174841bf81775b5975417f.pdf?index=true
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_313a76a026af475ca5d563c5c0a2ad2d.pdf?index=true
    • https://665985ba-8e9f-4173-b993-17a3090d61d7.filesusr.com/ugd/08421c_fcdd1c7f45394fe4bcec84ebcf4b2423.pdf?index=true
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_1b260ae06b924b96b1f1e6a97dddc47f.pdf?index=true
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_d97db1e870e64ed58a368008af08d21f.pdf?index=true
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_705eb9adebc448cfa9a01ac9114fa9d7.pdf?index=true
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_b2e82bdf8c654282b9e4fce0a0f99b6c.pdf?index=true
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_36e8d15c0e564e98be52fd140139d6bb.pdf?index=true
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_4c61baf56a4b4e3ca14400b9db62fe96.pdf?index=true
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_b1146ad7b8464288902f962d20b0e57c.pdf?index=true
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_6d3110e0cac94f248efbcf4b4ffbe0a0.pdf?index=true
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_3c76db22e4704806b238eb8128e8b2b8.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_off00011433.bin
a057df1b9971d0e518e896e9f27b25b9dc8838de07645d6b2748593fce0aedcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11433 5216 bytes
font_01_sfnt_off000125c5.bin
e88fe35c94912806fd1edcfab627cd9ff07a98fb37100106857b24c57a36ca10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125C5 12256 bytes
font_02_sfnt_off00014d72.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D72 4324 bytes

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