Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d55350aa01be46c…

MALICIOUS

PDF

79.7 KB Created: 2021-01-19 03:56:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 3cdca87f319d151138b7df10f7cb2fe6 SHA-1: 78ccfc382d0cc051196f2822ca6715e480fced3f SHA-256: 4d55350aa01be46c7a2ff6ae3faf1afe32f9459b7d7390e01023a26aeb64a8c6
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links pointing to various external PDFs, many hosted on disposable domains. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute malicious content. The presence of a known malicious redirector URL and ClamAV detection further supports its malicious nature.

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
  • 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://traffine.ru/aws?utm_term=critical+analysis+report+sample In PDF document text
    • https://cdn-cms.f-static.net/uploads/4483082/normal_5fe901e4e08ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416304/normal_5fc66c4832e8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501374/normal_5fea02bb7d914.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/hgKC0Aj/hakuoki_memories_of_the_shinsengumi_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482629/normal_5ff6d05688f67.pdfIn PDF document text
    • https://xijutenidipes.weebly.com/uploads/1/3/0/7/130775364/mesipidakaju.pdfIn PDF document text
    • https://cdn.sqhk.co/rosivapixove/hdBha7I/dwight_howard_celebrity_net_worth.pdfIn PDF document text
    • https://cdn.sqhk.co/vexedobasof/jjbjcaA/48357256140.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/ehdg8i8/sanatorium_meaning_in_urdu.pdfIn PDF document text
    • https://diforugagok.weebly.com/uploads/1/3/2/7/132741100/5dbae519d7.pdfIn PDF document text
    • https://mejiwixibunoxu.weebly.com/uploads/1/3/4/4/134402053/joselobora.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404290/normal_5fa59f1748a2b.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/hiideje/60663083360.pdfIn PDF document text
    • https://cdn.sqhk.co/pesenexur/WieigfY/ultimate_truck_off_road_center.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tofaveme.epizy.com/product_backlog_excel_template.pdfIn PDF document text
    • http://noxikemudenuma.epizy.com/application_format_for_internship_in_school.pdfIn PDF document text
    • http://nufudojor.epizy.com/central_market_athens_guide.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_off0000fcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC1 5084 bytes
SHA-256: f154c896bb8b58cf2b65ffb55f159b077ea93570d6efb99f9061637108b05d79
font_01_sfnt_off00010dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFD 10372 bytes
SHA-256: 58278f1ebf345f4a15d107fefd12624110b3355463e56fa58df234cf5c264adc

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