Malicious PDF — malware analysis report

Static analysis result for SHA-256 b176a244331c492c…

MALICIOUS

PDF

81.3 KB Created: 2021-09-23 21:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 891e649c775678437f86df0e79e04697 SHA-1: ae14036a1b28126c83a2faf7a0853e4f4fe5dd3b SHA-256: b176a244331c492c739ad29002a39417c0f4a58229bf0e24a42cbd1bc31fe597
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://bio-obst-und-gemuese.de/userfiles/file/21342161257.pdf In PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/fadirudixiginonasugo.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/a28ae8f33ec597f8e72099e90a091292.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/zudusadetovufuwusozumizoj.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/72416117626.pdfIn PDF document text
    • https://zagi.hr/files/38632351989.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b30e42a96---fafunezase.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/85109264240.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/62595934483.pdfIn PDF document text
    • http://panteres.com/files/files/65620212126.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/goduwutefuw.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/rezadojituzug.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/vegaramavekofud.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/18931981519.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130a41aa0db0---19135418587.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210910224443.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c39c6f0a11---14465755436.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/91988061733.pdfIn PDF document text
    • http://standardamulet.com/files/files/28378748297.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/71690147381.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/vegebo.pdfIn PDF document text
    • http://zgic.ru/!upload/files/29234610199.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/40639134737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=insta+online+last+seen+activity+tracker+premium+apkPDF 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_off0000d5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F3 10856 bytes
SHA-256: 54111fd1d3cd2ef83345ef0376d4ab3193d593461352bd6e94ec3616e3515667
font_01_sfnt_off0000ef13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF13 18256 bytes
SHA-256: ef875810bddd3c5a98c9f74eeccb1b59003ba43e3eff10b95aa8c80dc26753f9
font_02_sfnt_off00011f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1