Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc7319e0994dbeb9…

MALICIOUS

PDF

72.6 KB Created: 2020-11-23 19:20:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4bf35ad20137bde6e96d81c62f09062f SHA-1: 71553058f60428a65333da90a859eaf0d1a1d16a SHA-256: dc7319e0994dbeb9c40a7036c14edfdefa26d76e123d3b2fe01106b153b0cee9
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, including a critical alert for linking to known malicious redirector infrastructure. The document contains a large number of embedded links, many pointing to external PDFs, suggesting a link farm or phishing attempt. While no scripts were extracted, the presence of numerous malicious URLs indicates an attempt to redirect the user to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/strik?utm_term=nomenclatura+complexos+de+coordena%25C3%25A7%25C3%25A3o In PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/43a349bf4de6ea5.pdfIn PDF document text
    • https://fetibafavi.weebly.com/uploads/1/3/0/7/130776688/minunikadu_xalolusegug_valaziw_wifukatexu.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/8444efb68af.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/dagowokujifemonul.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/vinivuxo/airscreen_pro_apk_patched.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/zopenureputikazagetixo.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/super_smash_flash_2_unblocked_games_88_hacked.pdfIn PDF document text
    • https://s3.amazonaws.com/radaruropivoje/50850472764.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/dpia_guidelines_wp29.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7244149-5c47-467b-9fa1-464b9959cb71/8611219120.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/acupressure_points_for_back_pain.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/67762126625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7c172c6-f12e-43fc-87eb-f0879819244b/49167237948.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/anorexia_and_ego_syntonic.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_off0000cb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB29 5588 bytes
SHA-256: 91eade70f90abf1aa4088912192832e2a83271000bd83125e26ede5cd342256f
font_01_sfnt_off0000dd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD32 13308 bytes
SHA-256: dcbb14acb7e7689f2353408ecebdf5646f27ddab7d04acc7c3427af9edf04dcc
font_02_sfnt_off000104d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D1 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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