Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6fc2923abc9a18…

MALICIOUS

PDF

70.4 KB Created: 2021-02-10 04:45:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1d7db53b7849b08d88eedba54c5ae938 SHA-1: 9b429fe14aac222c41e41c8f08a26c1433f9199a SHA-256: ad6fc2923abc9a1811b6ac2e5c09120f12889565203b667ea8a409404b243e9d
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs, with a primary focus on redirecting users to sites like 'baarspo.ru'. The presence of many links on disposable hosting suggests a phishing or scam operation. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

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/123?utm_term=rolling+hills+country+club+paducah PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4372719/normal_5fce51f5021c1.pdfIn PDF document text
    • https://kekisuganuzab.weebly.com/uploads/1/3/4/7/134721312/zofafinow.pdfIn PDF document text
    • http://gixegiz.iblogger.org/michelin_guide_hong_kong_macau_2017.pdfIn PDF document text
    • https://jatitebomotopoz.weebly.com/uploads/1/3/0/7/130776336/kozujumeju-xobofof-zilozejolofeke.pdfIn PDF document text
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/9436725.pdfIn PDF document text
    • https://sepiximefajo.weebly.com/uploads/1/3/4/8/134849953/videkaturegijag.pdfIn PDF document text
    • https://degupapaji.weebly.com/uploads/1/3/0/8/130814014/zojamapategis.pdfIn PDF document text
    • https://sobemifukoku.weebly.com/uploads/1/3/4/8/134887972/nadizezub-bewebalatusami-feraniwivix.pdfIn PDF document text
    • https://xudepafuvinuk.weebly.com/uploads/1/3/0/9/130969511/rubitekonofijaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lulanojejol.epizy.com/96315069170.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/baby_feeding_guide_4_month_old.pdfIn PDF document text
    • http://gizogebinide.rf.gd/77081167187.pdfIn PDF document text
    • http://dapepefoga.rf.gd/professional_powerpoint_templates_free_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/atlas_de_carreteras_mexico.pdfIn PDF document text
    • http://repafow.epizy.com/cat_notification_sound_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/certainteed_roofing_warranty_claim_form.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_off0000d42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42D 5584 bytes
SHA-256: bc65a440addb5b46aa4d5634c1ffd7cc1cad1d29cde4d18be61f95aa47ccfce0
font_01_sfnt_off0000e72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72A 11092 bytes
SHA-256: 155549a5bd40a6a82998922835fc4af74d1eb2906f09af30ffa8afe095e77d21

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