Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd9ec34340d03070…

MALICIOUS

PDF

82.9 KB Created: 2021-09-12 01:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 18a6359cdeda19c40b05169095076a16 SHA-1: 0c108a20bea672c2f133e6c4ae396c9499525e9b SHA-256: dd9ec34340d0307055dff064fce68a5a0a372e5335a53cc51557ff31bf01fb98
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to various unknown PDF files, likely for phishing or malware distribution. While no scripts were directly extracted, the presence of embedded URLs and the overall structure point towards a phishing or social engineering attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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 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 http://zatacorp.com/upload/files/27089284754.pdf In PDF document text
    • http://antropolog.ru/userfiles/file/16773580897.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/44783725326.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/49438095499.pdfIn PDF document text
    • https://onecre.com/images/content/files/40241100983.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/89289433800.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/todolopata.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/kagigarajozusu.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/59606336079.pdfIn PDF document text
    • http://vanhacollection.com/images/files/kikarebirokupil.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/bijimubol.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/51807318343.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/suxavito.pdfIn PDF document text
    • http://normel.org/files/upload/file/95104092597.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/65284620624.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/56103780775.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/11565921797.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/98f666026a9a42cd3575c11552090d20/80173733636.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/31601139989.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210909201633.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/pogubikaj.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/xumegapovebefidituli.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/79917409749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=tanaji+full+movie+download+pagalworld+mp4PDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD396 11000 bytes
SHA-256: 7510d23b137149de025feb7927b9ad699e403e350582c24a4ff42a781a744454
font_01_sfnt_off0000ecec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 20852 bytes
SHA-256: 44664c7ebcd831b3db434401c9dfbd220b15a712c7143e6de83124ced78170fc
font_02_sfnt_off000123e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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