Malicious PDF — malware analysis report

Static analysis result for SHA-256 9028942fdb183f7b…

MALICIOUS

PDF

75.1 KB Created: 2021-02-18 03:48:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1dff021db23b43f80ce8dd3524566262 SHA-1: f4d495356ebb6c282db46c8fbb47877ccfd03b97 SHA-256: 9028942fdb183f7b577d39152a5bede6d616e862926e093e5a89fb0fdba6f58e
244 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs pointing to various domains, many of which appear to be disposable hosting. One URL, 'https://yafferge.ru/wb?keyword=is%20lime%20green%20a%20cool%20color', is flagged as a known malicious redirector. The document's structure suggests it's intended to manipulate search engine results or lead users to malicious content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wb?keyword=is%20lime%20green%20a%20cool%20color In PDF document text
    • https://rinotawobuv.weebly.com/uploads/1/3/4/7/134768279/foripobekodiwijizes.pdfIn PDF document text
    • https://cdn.sqhk.co/sejejajoxej/eFhhbhb/23239883298.pdfIn PDF document text
    • https://fekoguto.weebly.com/uploads/1/3/4/4/134491689/fosazew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425759/normal_5fd67b324244f.pdfIn PDF document text
    • https://cdn.sqhk.co/dikabopagesi/ttigmNk/bikim.pdfIn PDF document text
    • https://tilivugex.weebly.com/uploads/1/3/4/1/134108965/nububer.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeform.com/86133395853na3fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420761/normal_600899e8a59a8.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/jihgigV/54709975601.pdfIn PDF document text
    • http://avbox.org/lines_of_symmetry_worksheets_6th_grade1r7ti.pdfIn PDF document text
    • https://bokirises.weebly.com/uploads/1/3/1/6/131607331/6d1861e72.pdfIn PDF document text
    • https://cdn.sqhk.co/nulaliki/iiiipHd/minerals_in_granite_pegmatite.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413590/normal_602a98e876940.pdfIn PDF document text
    • http://prod-fruit.space/kifagavuboxobebuzinmpcc6.pdfIn PDF document text
    • http://wacc-cat.org/5762511557566aan.pdfIn PDF document text
    • https://cdn.sqhk.co/lazimafuxuxi/gchbebE/64771166234.pdfIn PDF document text
    • https://cdn.sqhk.co/duputokodoz/iibgcjb/inside_out_sadness.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sewamos/selimefujanavarazo.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/78002163774.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/guidelines_atrial_fibrillation_2014.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_off0000e798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE798 5056 bytes
SHA-256: f86925c9298f6244d784a84ce39e0fdad992af8f187c07894cbc26d1cdd594a6
font_01_sfnt_off0000f8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B0 11192 bytes
SHA-256: 0b3223f4ace09e968db486ed8ea683689fbe1968bd69daec749c66ba04c906e4

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