Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7fb8b2c1154c203…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 17:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d54e23ebc0ed0f20ad4f966fb2f1d69c SHA-1: fac01df5383ea887eacd939189a9fde22f4a2732 SHA-256: b7fb8b2c1154c203e800eae1818e903ff49e94ce4e4613db0934c908f6ac7491
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URIs, many of which point to PDF files hosted on potentially disposable domains, indicating a link farm or phishing lure. One URI specifically uses an IP address, which is a common tactic for evading domain-based detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://hotelbellevuepalermo.com/userfiles/files/pigikumotasemeg.pdf In PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613024b8850fe---pugemoli.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/92024536952.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/35961983014.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/laronofemujejuwopef.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/90416497053.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/fubilexibitomizukukuje.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/bipalanafulibenanufojulo.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/53888596132.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/kilanerobifet.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/vuzawaruzekuzapip.pdfIn PDF document text
    • https://edarky.net/data/file/74978947051.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/93999780095.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/26441921496.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/87216940952.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/xaberupadodovibipivog.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/91370445563.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109082104011322.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/17809015343.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/puvabokamug.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/nidupare.pdfPDF link annotation
    • http://panda-es.tokyo/yamituki-n/uploads/files/dupebirejaxa.pdfIn PDF document text
    • http://esangsok.com/upfile/files/bulizopurokirerefikega.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/62f61567dc1669346716094c0824afd3/namesegadul.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/ruvixogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+turn+off+digital+wellbeingPDF 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_off0000d793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAA 10676 bytes
SHA-256: 78a75e29338922011262b50021d44aeb7a79208d91833ce41114775140934204
font_02_sfnt_off00010801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10801 17780 bytes
SHA-256: 0d0e7babdbb2457cb308e0ffb99f9e3c2b6cc36ea9ee559bd570508772744482