Malicious PDF — malware analysis report

Static analysis result for SHA-256 850ccfe715711329…

MALICIOUS

PDF

68.5 KB Created: 2021-09-25 23:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 70707f891e47cdca65736db5998e6fc7 SHA-1: 0306c80fdab68487edf4d67a8dbda848f11db5d8 SHA-256: 850ccfe7157113293644742d4ec7d7c52c5ae7b252167670853ef255e87c7d01
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing campaigns. It contains numerous links to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. While no scripts were directly extracted, the PDF structure and heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://soudurelauziere.ca/upload/editor/file/85369735764.pdf In PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/dunigufepev.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/4592018444.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/14971981787.pdfIn PDF document text
    • https://web-idea.ro/app/webroot/files/userfiles/files/53701012498.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/37139862925.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/dubusugemafisapaw.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/4ed29a830b6aa56026f052c8aeb500b6/30177836505.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210923235611705.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/zijas.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/viwedoxifuju.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/rizuferex.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/mijaxuratu.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109250906417090.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/21448282212.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/xizowuraful.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/21464778116.pdfIn PDF document text
    • http://formacio.fic.cat/uploads/file/90628903873.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/d4cd18514d0cc230484a61d2c56ac992/86671578881.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/mudadafowisemekafazaf.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/21811001590.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/wafuxofoneganot.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/fikivajit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=good+base+design+rustPDF 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_off0000aff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF5 10656 bytes
SHA-256: d006b482a1acff5620cae0581f48857d4e7c0f63d379b9524a83dccda480f632
font_01_sfnt_off0000c853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC853 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE065 14540 bytes
SHA-256: 6f05d07c5fa37b6885477c480b775ed239a1bbdd2da6ddb59e9d1faec1a81900