Malicious PDF — malware analysis report

Static analysis result for SHA-256 2abca8056f70ff2b…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 13:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c4611443c3f6d3a1f21ca799d1cc6c4e SHA-1: 0bd2b48726f87f335a3f6e996b4390cf24bc89de SHA-256: 2abca8056f70ff2b9f7a0db12b85799696314a7795b9f03e147395069d116869
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for distributing malicious content or conducting phishing campaigns. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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 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://baove24h.info/upload/files/65644332444.pdf In PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/burodasopurumasaze.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613655c69e52a---34041387263.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/sufowaxetujedufen.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/97646408276.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb24534c5a---26390104404.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/pabiforivazoz.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/87639927105.pdfIn PDF document text
    • http://lukinserv.hu/file/91922309973.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/96901999997.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/bukekopimove.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/vejosifemor.pdfIn PDF document text
    • http://getdol.com/page_data/file/42382409520.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/97732882979.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021916175883112.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/94441464028.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090518114073499.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/kobapasetetogelapus.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/rojabilibatewazevug.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/55405360129.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/lavazobosubuwiner.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/15693650513.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210905220224.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/jutasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=smart+watch+keeps+vibratingPDF 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_off0000d903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD903 11112 bytes
SHA-256: f27fa31f13f28a5ba6dc7acd687f46c64df62434b9972dcd6a86fd154e57e570
font_01_sfnt_off0000f29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAC 19064 bytes
SHA-256: bdac62d187f935fa0684c3ad3d4f25573d8ec58c2f96d53ebac9da914ccbedfc

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