Malicious PDF — malware analysis report

Static analysis result for SHA-256 35791c10181bd717…

MALICIOUS

PDF

72.5 KB Created: 2021-05-27 09:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d7ba4e96390b4249190634d769031e8b SHA-1: cbed4e369a5ba30d12883962750f55725557df6b SHA-256: 35791c10181bd7177cc91b9616e5dbeae00d28452647a959e9ba2a680189c63e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, and one primary malicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to a 'free illustrated devil book PDF', which is a common phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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 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://xezojetit.ru/strik?utm_term=libro+el+diablo+ilustrado+pdf+gratis PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450249/normal_60016877a8a5d.pdfIn PDF document text
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/2299251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370068/normal_60634b579d4fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412170/normal_606e499400046.pdfIn PDF document text
    • https://radasezase.weebly.com/uploads/1/3/4/6/134643415/zuwel.pdfIn PDF document text
    • https://zunitilamurako.weebly.com/uploads/1/3/4/5/134529552/vorerivojukat.pdfIn PDF document text
    • https://xibigulekin.weebly.com/uploads/1/3/0/9/130968960/pujogezatil.pdfIn PDF document text
    • https://xisevulatunetu.weebly.com/uploads/1/3/4/5/134595014/b1f47f38df8f37d.pdfIn PDF document text
    • https://zinadilijisud.weebly.com/uploads/1/3/4/6/134619113/wofojubutedag-vonirimus.pdfIn PDF document text
    • https://fedubipogumuwu.weebly.com/uploads/1/3/1/3/131379546/ae992b3ee2.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/6125751.pdfIn PDF document text
    • https://zevakevo.weebly.com/uploads/1/3/5/4/135400716/vudagazofemap.pdfIn PDF document text
    • https://vejupurujiku.weebly.com/uploads/1/3/1/6/131606174/7afde90c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406466/normal_606142549e9a1.pdfIn PDF document text
    • https://gukegibulu.weebly.com/uploads/1/3/4/6/134668459/5915580.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368222/normal_606ea093bd91b.pdfIn PDF document text
    • https://dafizoxov.weebly.com/uploads/1/3/5/3/135309439/d4fae9d1a9685.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/59285c60-bfab-4c2d-8e80-a6ef08ddd815/how_does_a_tasmanian_tiger_defend_itself.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8751110-8d0a-4758-9500-60d3d2dea22a/from_the_mixed_up_files_of_mrs_basil_e_frankweiler_chapter_7_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed266642-7d6d-4ae1-8fe6-322acd9e6ec4/25484799572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc6d5c81-45ac-45dd-a06c-9cb1127bc213/46362207169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad1ad4df-f563-4bd6-bea1-9c1a70264651/qiagen_gel_extraction_kit_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2df6caf1-a46a-44ee-98a1-0de8597cd31a/limites_trigonometricos_con_cambio_de_variable_ejercicios_resueltos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00a7b161-8390-4184-8f80-3ea9445a400f/what_is_trade_dress_for_uber.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b87f090b-cc34-45cd-83a2-ffa79545cdf2/59168061019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3b99e80-f818-4a86-be25-be9c3bf1df24/turkey_brook_park_mt_olive_nj.pdfIn 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_off0000d299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD299 3144 bytes
SHA-256: 100a28dd242565e8b8bb46a533e32c6853beb1ff253c5d6f184f24f5888b1de7
font_01_sfnt_off0000ddd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD6 5288 bytes
SHA-256: b734cffd1e5d8e0435af116081b021fbd6ef0fdce6f4a95cde02530c29c6f2c3
font_02_sfnt_off0000efdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 10852 bytes
SHA-256: 6396df786f8c6d69df738158a6b9bf09a7914951e05dfe7b29a1259c7dbeccea

Open this report in the interactive analyzer, or submit your own file for analysis.