Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03966ba0a12edc4…

MALICIOUS

PDF

91.4 KB Created: 2021-03-16 08:45:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 57d6f64fc3065ba2c83defe69e60facb SHA-1: 1e73acfdcd3afab50c77b17cfc49cfc391660f87 SHA-256: a03966ba0a12edc48e67fe26733a6bd3ede70a3816276bf4f3909bb2a350eaf8
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on `https://resalured.ru/strik?utm_term=asus+rt-n12d1+firmware`. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates that the PDF is part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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=asus+rt-n12d1+firmware PDF link annotation
    • http://fastdonwload.space/6339626422973xjs.pdfIn PDF document text
    • https://tosofeguwus.weebly.com/uploads/1/3/4/3/134321705/1440634.pdfIn PDF document text
    • https://satizivuzaked.weebly.com/uploads/1/3/4/3/134383512/puxupigaw_gixebujewis_siroseko.pdfIn PDF document text
    • http://recepty-dd.info/77531466511sn62l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406228/normal_5fd29d93ad01a.pdfIn PDF document text
    • http://nepojar.22web.org/leveling_mining_classic_wow_guide.pdfIn PDF document text
    • https://powelogub.weebly.com/uploads/1/3/1/8/131871449/pixaviviwamemorejule.pdfIn PDF document text
    • https://sorilegumuda.weebly.com/uploads/1/3/4/8/134886674/1490949.pdfIn PDF document text
    • http://dovulup.iblogger.org/flat_stomach_detox_smoothie_recipes_for_weight_loss.pdfIn PDF document text
    • https://vipagazowarofi.weebly.com/uploads/1/3/4/6/134685611/67b321.pdfIn PDF document text
    • https://jabiwogox.weebly.com/uploads/1/3/1/4/131453485/nuxekuwe.pdfIn PDF document text
    • https://rarezeromodon.weebly.com/uploads/1/3/0/8/130874170/nadirebo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391315/normal_601b38d4f11f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/retobifulipo/tevamanuwoxebitosiwav.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/cadre_photo_grand_format_aluminium.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/mekanawanewu.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_off00011867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11867 5092 bytes
SHA-256: 89849e3c45b99b0623cc58891018c47cf7b815d605a2341dd88485faf7587648
font_01_sfnt_off000129ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AB 11572 bytes
SHA-256: b0a796b43f4368ece0b803cf3966661a38af820b70224604f90eee460cae4d15
font_02_sfnt_off0001513f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1513F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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