Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a349fcb0582778…

MALICIOUS

PDF

78.4 KB Created: 2021-02-15 21:31:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 41221a9b2bc94733ff53f866ddaf53cb SHA-1: 6376c2aeb39be1a41c31fa945e525eb9cdba57ab SHA-256: 89a349fcb058277879932eb6da0203ba651acf82650c9119863f09d77b4a1084
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning and phishing. The primary URL, https://jottigo.ru/strik?utm_term=how+to+fix+not+registered+on+network+on+samsung+a50, suggests a lure related to a technical support scam. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or conducting phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://jottigo.ru/strik?utm_term=how+to+fix+not+registered+on+network+on+samsung+a50 PDF link annotation
    • https://wunobenera.weebly.com/uploads/1/3/4/8/134887230/gemibafijox.pdfIn PDF document text
    • https://buserakufazuwus.weebly.com/uploads/1/3/4/0/134097478/xusuzupunawulekosuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414689/normal_5fccb3659b5cc.pdfIn PDF document text
    • https://xujufefar.weebly.com/uploads/1/3/1/4/131483110/2172aad232157.pdfIn PDF document text
    • http://madamzero.com/hardware_store_new_orleansuwzpi.pdfIn PDF document text
    • http://josogub.iblogger.org/exercises_reported_speech_advanced_level.pdfIn PDF document text
    • http://formblckr1.xyz/xuzodajajasumopewzg33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482880/normal_5fdea105bfa51.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
    • http://voxosejak.rf.gd/gogifi.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/instituto_benjamin_constant.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/algorithmic_game_theory_nisan.pdfIn PDF document text
    • http://vamivesuger.epizy.com/eye_cloud_camera.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/music_player_for_java.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/basic_civil_engineering_text_book.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_off0000e52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52C 5528 bytes
SHA-256: 965561e0233ebb6264cc7b0789bc56616d2f8689608413ceda1050373f4ff6c2
font_01_sfnt_off0000f7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FB 10604 bytes
SHA-256: 9b358c8638941e569d7b272eddf917f289553a58a50ffb77c73e83201f1238cf
font_02_sfnt_off00011c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C39 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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