Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42034c5d8dc91ff…

MALICIOUS

PDF

76.9 KB Created: 2020-11-25 16:27:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f7778bbc35a904e1d407932479ed8075 SHA-1: 7d5db4d86228b256da1874ab55d6f214803f917b SHA-256: a42034c5d8dc91ff90746529bbce20d4175ed622f6631105dee3f164de4a71f0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely exploits vulnerabilities or contains malicious content. The heuristics reveal it functions as a link farm, embedding numerous external URLs, with one prominent URL being `https://traffset.ru/strik?utm_term=the+broken+jug+1937`. This suggests the document's primary purpose is to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/strik?utm_term=the+broken+jug+1937 PDF link annotation
    • https://temazerezeveleg.weebly.com/uploads/1/3/4/7/134763385/lexepufew_teraluji_nagubez.pdfIn PDF document text
    • https://vokevifiv.weebly.com/uploads/1/3/4/6/134657891/68c21bce2.pdfIn PDF document text
    • https://jerimokini.weebly.com/uploads/1/3/4/4/134484757/a2019579.pdfIn PDF document text
    • https://nebakeji.weebly.com/uploads/1/3/4/6/134649015/jofosolenuwi.pdfIn PDF document text
    • https://fewevivib.weebly.com/uploads/1/3/0/8/130813821/1cb9894be10.pdfIn PDF document text
    • https://sibojigejediwij.weebly.com/uploads/1/3/4/6/134606131/lomiwozotad-zowiwivaf.pdfIn PDF document text
    • https://xosotujusosevo.weebly.com/uploads/1/3/4/3/134377620/mapemalala_mujufuxowor_kigebat.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/basixiralopevajekubu.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/mijedusovineti/alpha_phi_alpha_rho_sigma_lambda.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/arciform_lesion_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c3bda40-4b97-4a78-95d1-d71bff74d154/harlequin_presents_free_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70cf5c67-b856-451a-9320-7abbaac9f9a9/love_nikki_apk_download_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a540c6aa-0786-4343-8c5f-309b25304d7a/where_have_all_the_lightning_bugs_go.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_off0000e43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43D 4960 bytes
SHA-256: d816146880ec0687be79ea819521fefe97c94059218fef76b0e2dac565ea92f8
font_01_sfnt_off0000f528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF528 10472 bytes
SHA-256: c2c21fbd0b6053d6dac6d31a9bdb5dafcf8c2e5dd9a1f7a5eb9e00e99f9d682c
font_02_sfnt_off00011895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11895 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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