Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a291c1ae6017a27…

MALICIOUS

PDF

67.1 KB Created: 2021-09-24 21:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c72a1897833c11efe23b172e52d4adec SHA-1: e0e03edf2d3bd120e5f4688d81d435b2ae269a4c SHA-256: 8a291c1ae6017a2763171d5eb39163e4ab72d1cd0ca799366ed36d4c350f51c1
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The 'PDF_IMAGE_LURE' heuristic indicates it's an image-based document designed to trick users into clicking an embedded action. While no scripts were directly extracted, the presence of numerous unknown URLs suggests a link farm intended to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 67 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://cobrawire.com/userfiles/files/rawovisu.pdf In PDF document text
    • http://korio-olsztyn.pl/userfiles/file/nowoluxivapipefev.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/vixumujegogadi.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/71886757041.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/88498765367.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/10458424827.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/bewasewifimetatulejir.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/wopodukov.pdfIn PDF document text
    • https://hum639hb2-hh38.com/contents/files/65314098268.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/pezimoripiganozetoker.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-17/20210917040740966486.pdfIn PDF document text
    • https://flammerouge.ch/userfiles/files/vivadafeluzeg.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/davoxunimak.pdfIn PDF document text
    • http://opsir.eu/files/file/39657894230.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/nugerup.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210902142119.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6ded979e9---92678679972.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/35730028673.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614737e90decc---gixejok.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/weluwedosanilo.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/wopegawatulolaweguxofa.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/10859197414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=green+emoji+androidPDF 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_off0000ab7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB7B 10268 bytes
SHA-256: 01a19716bfee7aa2ebd8a69d4e9cd5f3c1089662371f523774ade21113cd034b
font_01_sfnt_off0000c26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC26C 13940 bytes
SHA-256: d9cfe955b4bf2e637afcd11c30d0eba0932de114f48ab26ee9f8836de4651e01
font_02_sfnt_off0000e4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1