Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a08fdfb032fefe3…

MALICIOUS

PDF

65.9 KB Created: 2021-02-06 17:04:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 71f9da3cc80af6e9c34b8a89795ab013 SHA-1: e5ad4b1b0356f5c4ade7a7661d0317f6f33669a6 SHA-256: 0a08fdfb032fefe3e438ffc23e19ea9ecf214e5932b859e2b36d56fb44b592b4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing malware. The presence of numerous external links points towards a potential initial access vector via spearphishing attachment.

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://leonvi.ru/wb?keyword=scantron%20forms%20printable%20free PDF link annotation
    • https://bapanezuginu.weebly.com/uploads/1/3/5/3/135310050/sonowikavajodokat.pdfIn PDF document text
    • http://nawilojobate.iblogger.org/immediately_sentence_formation.pdfIn PDF document text
    • https://xalojuxovev.weebly.com/uploads/1/3/0/7/130774978/waporozadojaru-jibereluturef.pdfIn PDF document text
    • http://kadabafomelu.66ghz.com/ansys_workbench_full_form.pdfIn PDF document text
    • http://nefritthebestthing.site/61017320276akggc.pdfIn PDF document text
    • http://vejefulolite.22web.org/vosig.pdfIn PDF document text
    • https://soregoba.weebly.com/uploads/1/3/0/7/130739918/bujub.pdfIn PDF document text
    • https://nosisakapu.weebly.com/uploads/1/3/4/7/134773138/47c865d7ae.pdfIn PDF document text
    • http://xuzetekuka.22web.org/gixobew.pdfIn PDF document text
    • https://wunanowadile.weebly.com/uploads/1/3/4/6/134600652/vajenopev-xomive.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://derekage.epizy.com/outlook_email_template_image_size.pdfIn PDF document text
    • http://peguretunemidom.rf.gd/chloroform_definition_and_uses.pdfIn PDF document text
    • http://suxivivuvadife.rf.gd/desperado_piano_sheet_music_easy_free.pdfIn PDF document text
    • http://sakigekoxigukil.epizy.com/50421943410.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69C 5404 bytes
SHA-256: 837c03662a7b3f720d799ba1f41f2f69ba01569aa1ff9a246fa38626762c669e
font_01_sfnt_off0000d8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E7 9964 bytes
SHA-256: 42287e7559255119579305bae4c2f830a677977566565eb02dd0bff342afe428

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