Malicious PDF — malware analysis report

Static analysis result for SHA-256 314386584bd549b4…

MALICIOUS

PDF

74.6 KB Created: 2021-02-19 21:56:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 6a4510d272fd1d19865249ffd5fded45 SHA-1: 6f1cbea7a7ad4181edbbb1c4e714991a78f46ba8 SHA-256: 314386584bd549b401be2e50ddaf4031bcd0e5feca27b068af2c36cf4d1ec2b0
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 SEO spam operation. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the heuristics strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=what+do+you+mean+by+desktop+virtualization PDF link annotation
    • https://cdn.sqhk.co/zeliravepuj/oie1he4/46410414805.pdfIn PDF document text
    • https://gadonivoxe.weebly.com/uploads/1/3/5/3/135331758/adbf83e2.pdfIn PDF document text
    • https://cdn.sqhk.co/kevapaboxer/ghii5ji/94984082926.pdfIn PDF document text
    • http://morpeoplelife.ru/lofolarixugo45rz9.pdfIn PDF document text
    • http://mishabelle.ru/78874287446bm1js.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/geGRbhd/bubito.pdfIn PDF document text
    • https://rizizisexulap.weebly.com/uploads/1/3/1/4/131407181/geniderenojukitoze.pdfIn PDF document text
    • https://cdn.sqhk.co/zubuwebofe/feOjeii/ivanka_trump_mother_today.pdfIn PDF document text
    • https://xexigajusotojuz.weebly.com/uploads/1/3/1/6/131606060/9377329.pdfIn PDF document text
    • http://itdiscount.pro/how_to_change_master_code_on_vista_21ip7nmno.pdfIn PDF document text
    • https://nunosutelakib.weebly.com/uploads/1/3/1/3/131383720/gozidoziwudas_lowosekarur.pdfIn PDF document text
    • https://parexuboruz.weebly.com/uploads/1/3/6/0/136089541/c431ab6e.pdfIn PDF document text
    • http://milanomoda-italy.website/harry_potter_8_movie_caste866h.pdfIn PDF document text
    • https://nilidufudomalo.weebly.com/uploads/1/3/2/7/132740748/jelulafo.pdfIn PDF document text
    • https://cdn.sqhk.co/gotuxixovumu/ijihfUM/fedowomelika.pdfIn PDF document text
    • https://dumidonawusirug.weebly.com/uploads/1/3/5/3/135306770/8453714.pdfIn PDF document text
    • https://xudinenudomojuv.weebly.com/uploads/1/3/4/3/134356320/2408077b1a1e.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://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_off0000d7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BF 5512 bytes
SHA-256: aa6a327c545c06941d800cb6aa6edf7776fe46db65bf7fd1c0be908ab4224c8a
font_01_sfnt_off0000ea65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA65 10720 bytes
SHA-256: bd0aa117a18b9735a3b7717e1260866a89ea194972e253352ef9552e7fd46619
font_02_sfnt_off00010f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F09 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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