Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b83d1b2421fd18…

MALICIOUS

PDF

69.9 KB Created: 2021-06-08 23:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 457b8dff98640b7edb0e8432c361ba6e SHA-1: adbcdde4d8303169920d608b4c133064ecf68ff6 SHA-256: b5b83d1b2421fd18f874efac2107713107f30e022bf8fd5a9a7253cc9c8e1a1c
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 hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://queure.ru/pbw?utm_term=aaina+movie+jackie+shroff+download PDF link annotation
    • https://zedasadexim.weebly.com/uploads/1/3/0/7/130775923/buzokaxit_nojomukex_dulujenipo.pdfIn PDF document text
    • https://nimapefakapag.weebly.com/uploads/1/3/5/3/135324130/jenufizewadegut_diloxidi_mibezasura_fegigelol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392215/normal_60269d6edb493.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374847/normal_60547aaa96cce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485810/normal_600f82edb5d28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502567/normal_5fdfd47fb4b63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461516/normal_60623ff2a2422.pdfIn PDF document text
    • https://tejekukukageza.weebly.com/uploads/1/3/4/6/134662245/fopopotefapolin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490524/normal_60392bef14557.pdfIn PDF document text
    • https://tefewijinoxo.weebly.com/uploads/1/3/4/8/134881123/8937915.pdfIn PDF document text
    • https://jajatimipe.weebly.com/uploads/1/3/1/4/131482958/0153f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_5fd3dc615847e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419218/normal_5feff31354185.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483833/normal_60102c4868a63.pdfIn PDF document text
    • https://tudimase.weebly.com/uploads/1/3/5/9/135985307/zamekavob.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4412394/normal_60b3e431ea069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447251/normal_605d6f3daf9f1.pdfIn PDF document text
    • https://fofevupug.weebly.com/uploads/1/3/4/4/134490210/kumabowopekisat-tomefani.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372673/normal_60098eedea5ac.pdfIn PDF document text
    • https://vufevilasok.weebly.com/uploads/1/3/4/3/134314299/gemugapakovivuset.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/71976cfb-06a1-4876-9ebf-d066af4bb221/what_is_the_interest_rate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90d4b4e2-6c7b-4c62-95ce-9c8cf7145609/91914462137.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68508c88-e77d-402e-bc1b-871a23a9335e/45006423308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a194ebc7-114a-41a4-9a9c-665d349fa2c8/walking_in_a_winter_wonderland_piano_sheet_music_free_easy.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD162 5540 bytes
SHA-256: 8229e4d42aaa41449831a082c6e0be024443df208c508c5aeb20906f00be53a3
font_01_sfnt_off0000e42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 11300 bytes
SHA-256: b20f5298c92f2bad17884184cca0de855aef0b96f5d6622fd3694d793d28769e