Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1781c31bf27c1e…

MALICIOUS

PDF

69.0 KB Created: 2020-11-09 20:36:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e5e45298ba1612d509828259c77100fc SHA-1: 73bf649d8a61d74eb3a674c68190186471bd37ea SHA-256: 6c1781c31bf27c1e59eddadb9c78d12f2d144905eeb362ea1558547d7fb06f6c
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 a phishing or trojan distribution attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The primary lure appears to be a 'download hack clash of clans' prompt, aiming to trick users into visiting these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/123?keyword=download+hack+clash+of+clans PDF link annotation
    • https://fukudikewug.weebly.com/uploads/1/3/4/6/134686524/d97d18fcce57.pdfIn PDF document text
    • https://xumokiregiw.weebly.com/uploads/1/3/4/2/134266049/5228480.pdfIn PDF document text
    • https://wefejakero.weebly.com/uploads/1/3/0/8/130814310/0ae2d5f7a89.pdfIn PDF document text
    • https://jutivodip.weebly.com/uploads/1/3/4/4/134489611/f46c5c.pdfIn PDF document text
    • https://juvuxoxeziw.weebly.com/uploads/1/3/4/3/134313380/vatir_pixitujozixida_kibis_nilifiwafo.pdfIn PDF document text
    • https://kifobanirijo.weebly.com/uploads/1/3/4/5/134595275/tugusarewabotu-pusevezi-vegunikerudexo-vewora.pdfIn PDF document text
    • https://wujibinofowe.weebly.com/uploads/1/3/1/3/131383737/2573217.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8316652e-0d7e-4763-a1e1-7be9c25a9f85/bafufomiwagojuvaxoberop.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/25806729150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca7bc6cd-4ae1-43ac-abd0-7efb2ce100dd/linux_make_executable_permission.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8a7f3ce-a178-4b29-bf86-84dc3b1d2160/livijik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63dd0953-3490-4e98-8ed6-6255ba349128/10442205323.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39332fd9-b82f-4af4-9f2e-4b95bca5b734/fortnite_hidden_f_location.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_off0000caa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA8 5168 bytes
SHA-256: cf9cafb5c962142b13dbe8dcb43683889861298ffeb2b9c79975c9e6f686e535
font_01_sfnt_off0000dc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC50 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000e4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DD 10048 bytes
SHA-256: 3582ad9ddd53cac4a05fb292d6f7b0ebf1202ee96e70855355564d9e1bcf3d2a

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