Malicious PDF — malware analysis report

Static analysis result for SHA-256 99befe7acef096bd…

MALICIOUS

PDF

68.2 KB Created: 2021-09-25 20:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a015f6e232e17f1bfcceaad85d73c20f SHA-1: 417d1e8bb92baa53902e6be88f16bab214ca255d SHA-256: 99befe7acef096bd0a4cac843532da2a3cd33cdaeb5178f36294165da684bc1c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-only lure, a common tactic for phishing or malware distribution, indicated by the PDF_IMAGE_LURE heuristic. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://infrive.ru/uplcv?utm_term=c%2B%2B+primer+5th+edition+pdf+free+download PDF link annotation
    • https://himalmanpower.com/ckfinder/userfiles/files/94107335558.pdfIn PDF document text
    • http://talesma.com/E/file/xilik.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/somuzazew.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614905fdef98a---56626326607.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/siwovovukusi.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210907181439.pdfIn PDF document text
    • http://beiks.info/public/file/kobodumejesutimuvineb.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/42583087466.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/jevofunolipifoferaje.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/diveduvutu.pdfIn PDF document text
    • http://mobil-tech.com/files/6308836504.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/58716166957.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/98123791337.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/miroberomugowudej.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614a21d911d48---tifizuwomikajobefeb.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/pegidijumelumulejigazi.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/zitizeguna.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xudaj.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/22871537386.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/zomudebexixogisifinumu.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021092109564441.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/gejele.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_off0000abfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABFA 10848 bytes
SHA-256: d09e5dc2b9b886c935b68e6ce2b047baaba4677941250998c96a15d2d638e89d
font_01_sfnt_off0000c4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E8 14476 bytes
SHA-256: 3949ec0346f347cecc0b252cf368535330cf2cb13dc67055f092401c27ea303e
font_02_sfnt_off0000e936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE936 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1