Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df1c1065fd51829…

MALICIOUS

PDF

71.0 KB Created: 2021-02-18 02:48:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ee571a2407a99f9ad74f08075711f062 SHA-1: fddbcdd3928f9590ba04a929bab4599038b97da3 SHA-256: 8df1c1065fd5182994be5530da88c4efddc452f086273237bd7281999786630f
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded URLs are likely used to redirect users to malicious sites or to distribute further malware.

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
  • 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://bologen.ru/wb?keyword=diary%20of%20a%20wimpy%20kid%20deep%20end%20book PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451208/normal_5fe370be2e62f.pdfIn PDF document text
    • https://cdn.sqhk.co/vemegunir/dic4qfs/good_podcast_stories_on_spotify.pdfIn PDF document text
    • https://nozodipipagim.weebly.com/uploads/1/3/1/4/131438171/665c7319.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/ghhgja4/samuwolujineg.pdfIn PDF document text
    • https://ragajepegoxi.weebly.com/uploads/1/3/1/3/131379061/loxifosexaraf-tipuwuzaritilix-sarenu.pdfIn PDF document text
    • https://reponobokuwe.weebly.com/uploads/1/3/5/4/135401207/mibujupazowoboxe.pdfIn PDF document text
    • https://niwogowepovem.weebly.com/uploads/1/3/4/7/134767936/timubivinoguna.pdfIn PDF document text
    • https://zonozedu.weebly.com/uploads/1/3/0/8/130874021/1de4a8a89a4094.pdfIn PDF document text
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/gabaviwo_fabokog.pdfIn PDF document text
    • https://xapitutas.weebly.com/uploads/1/3/0/8/130813648/349200c54f86e19.pdfIn PDF document text
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/lezonamuset.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502817/normal_5fccb2251268c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427284/normal_602c1d02b1216.pdfIn PDF document text
    • https://polabobaxadujo.weebly.com/uploads/1/3/4/7/134775235/zodobi_jegone_foxot.pdfIn PDF document text
    • https://cdn.sqhk.co/xakurusuk/fhj6D84/60514660811.pdfIn PDF document text
    • https://komomagifagele.weebly.com/uploads/1/3/4/7/134705279/686fc3a9781891.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/xirixepo/luzekuvikebuxelol.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/bluetooth_keyboard_apps_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/54575850716.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/9490587811.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_off0000d21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21A 5376 bytes
SHA-256: d527fb4f6432cfca055d05439236a9b27fd28009b871f255d911c3f2c1520d0a
font_01_sfnt_off0000e46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46F 13332 bytes
SHA-256: 9a3024fb214dec503629d29e342af95f69db7e60ace2eaf8d0a255ee7ab7d51a

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