Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bbef6e092a9f549…

MALICIOUS

PDF

81.1 KB Created: 2021-09-10 02:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b6e61dadee802371bb8aa9786474c5a4 SHA-1: b808fbf8469b46c9ad66ddeec115aa28a41822f9 SHA-256: 8bbef6e092a9f549c71294c70dd2e1923f1860944c3d1f69f74cf59f7fcb7217
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the heuristic 'SE_DOWNLOAD_BUTTON' further support the attack pattern of directing users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=ceed+2010+answer+key PDF link annotation
    • http://fohow77.ru/upload/file/pogirobekupo.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a802e7164f---97731431863.pdfIn PDF document text
    • http://zenithmetals.com/files/72407355077.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/vezipamalobozo.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/59641118595.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/gumuwizidapelitodirulem.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/44685518933.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/44307379575.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/kejumolixusideso.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/39640928174.pdfIn PDF document text
    • http://topp.pl/_topp/file/78188780220.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/1049157174.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/69590938307.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613590e8045fa---kigisisuzurutavatu.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/dinesuxipopuwalerujev.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/nopatinutuxakeginivusegu.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/30146987141.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/vemitofanevefirusibazat.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/62549662260.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/dufok.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/riduzelusuleferuxiludepax.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/31763567872.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://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_off0000d9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A2 10500 bytes
SHA-256: 31704f44797b90e0823fe8d8206435c710e9ef6cf76e274b3b4d21787be46dd7
font_01_sfnt_off0000f1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F0 17368 bytes
SHA-256: 6ed29b5310a8301143cd466beec37aa8fdff87bea3c5410bbd00d8348fa09c6d

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