Malicious PDF — malware analysis report

Static analysis result for SHA-256 995c7aec9ab9d603…

MALICIOUS

PDF

82.1 KB Created: 2021-06-06 21:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 476d3c0ad8c6c332a3aa1be021715fd7 SHA-1: cad4564ebfb6dbddb5158af52282a412f2dd3f59 SHA-256: 995c7aec9ab9d603213e58a2e1359fe9a29b1df09e7cbade7ce59236d8d8d993
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The presence of embedded URLs and the PDF's structure strongly suggest it's part of a phishing campaign, likely using embedded JavaScript to facilitate redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dugedepap.ru/123?utm_term=chapter+21+absolute+monarchs+in+europe+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417995/normal_5fefaa1741331.pdfIn PDF document text
    • https://sufafiderek.weebly.com/uploads/1/3/0/8/130814754/5281742.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450721/normal_60080bd71a2bc.pdfIn PDF document text
    • https://raduwefun.weebly.com/uploads/1/3/1/1/131164260/6230914.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4417643/normal_60b358a442965.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445104/normal_5ff3618351ea8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418379/normal_5fdbb0ebad921.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474456/normal_606719606266c.pdfIn PDF document text
    • https://bamufikike.weebly.com/uploads/1/3/1/6/131606241/vuruxofidatakevu.pdfIn PDF document text
    • https://nexawukuvinu.weebly.com/uploads/1/3/4/5/134578226/gepurip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409628/normal_5ffba684ef7f6.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://uploads.strikinglycdn.com/files/94eb362f-d661-4c18-a1fd-7dd75becfe50/frank_hammond_obituary_peterborough.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144413754/simple_explanation_of_delegatus_non_potest_delegare.pdfIn PDF document text
    • http://vazesuna.pbworks.com/f/fitobalomezalulofefugojow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d09f2215-cd36-4e76-86ec-dcb29f1a54bb/2000_jeep_grand_cherokee_4.7_v8_towing_capacity.pdfIn PDF document text
    • http://wiliser.pbworks.com/w/file/fetch/144474375/40786193171.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80830982-ebfa-4760-a8fb-0e45cc216187/gudirotetudofudupuxobu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd398245-fbbf-4f27-ae8f-311445a6ae19/gaxujupap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/105777b0-085f-43d2-b5d4-01ad2774ba5c/rinnai_heater_error_code_11_fix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f45d4271-dda6-4ba9-8156-16f755489bc0/watsons_go_to_birmingham_chapters_11-15.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26b64464-b4b4-473b-b8e1-5f1ef898f401/que_son_fichas_biograficas_ejemplos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06086c5e-1a69-4748-ad34-abe7fbe8df58/89013033957.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_off0000f380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 5624 bytes
SHA-256: bb5be94c15a4882d30de9dbb184db23ddf8fbc7ce80fca8e81d0f8ae43b33de1
font_01_sfnt_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 10728 bytes
SHA-256: 3d11499771093ece4be1f51f0a470e9ec3fb34a6dc17e0095be706fb7d315794
font_02_sfnt_off00012b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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