Malicious PDF — malware analysis report

Static analysis result for SHA-256 6afda4319bd44bdb…

MALICIOUS

PDF

83.2 KB Created: 2021-10-09 10:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3aa17d6b4c9e9090eee7f6acea444b5c SHA-1: c162d06272462673d96b56b17b51b79fdb319d7c SHA-256: 6afda4319bd44bdba6f6d301b3110f23dc4833304a42c19e5f38340513b1b931
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, with a high-confidence heuristic indicating a link to an algorithmically-generated URL likely hosting a malicious PDF. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to trick users into calling a fraudulent number, consistent with phishing or tech-support scams. While no scripts were explicitly extracted, the nature of the links and the heuristic firings strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pistant.ru/uplcv?utm_term=how+much+is+28+ounces+of+water PDF link annotation
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/vokl41b29v6i4mn6cjku1rtpup/mawifotomo.pdfIn PDF document text
    • https://cmoretv.com/userfiles/rizaxodibup.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/vetun.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/f20e0737944da1e948427750d33d30bd/vixuzabewipuporip.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/44007725531.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/guxelomawejawivobe.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/sodekukedetixodima.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/17624235087.pdfIn PDF document text
    • https://mmszke.hu/files/file/balopujinevugisirowemoluk.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/torigesejagu.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/63995667243.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/91339724329.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/50457919902.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/romewabomat.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/6385805521.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/xumusigisaguso.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/56923354902.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/lilusemofewezedegapoda.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/posagu.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/84108760953.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/vetotajajigoja.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/19163286073.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/zimisumasodufetox.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202110060552256031.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/49005955765.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_off0000dc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6B 11060 bytes
SHA-256: 8318bf2f0e094da1502b72ea70b521221c90ab0b37ed75156a07531e6e1ff31c
font_01_sfnt_off0000f618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF618 18876 bytes
SHA-256: 83accbb781580fe9531b75539a23fcd569d8d9d5612860eb9f5e376ff373724e
font_02_sfnt_off000126c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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