Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2be9644ce9c4b0…

MALICIOUS

PDF

87.5 KB Created: 2021-09-17 06:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa4b4d685be59bc00d7c10c4ef891a7d SHA-1: 03a27b1e37d9803330be38263b3e250d1dfd1aac SHA-256: 8f2be9644ce9c4b0d68b239498a41ae0fe13f51e448dd55a42d38a4edf73e433
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to execute code and redirect the user. The presence of a callback lure and a link farm on disposable hosting suggests a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload or lead to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=charlie+and+the+chocolate+factory+full+movie+online+watch PDF link annotation
    • http://futureinfashion.com/ckfinder/userfiles/files/13594433837.pdfIn PDF document text
    • https://dom-titan.rs/files/xuvanotikisofugoj.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/32947043460.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/refimitofe.pdfIn PDF document text
    • http://mrybalko.ru/files/4854502956.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1fcf40951---natatabodorulepixoderede.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/78094724166.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/demurixapipaxuworekexaz.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/45637240276.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210901_102844.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/10166065871.pdfIn PDF document text
    • http://baove24h.org/upload/files/bekafu.pdfIn PDF document text
    • http://twilaw.com/files/files/94002811032.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16140f7bf61ef0---napejonupanolurewow.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/20172415587.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/62104600635.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/xovadelujozuvexuxafipe.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/raxiw.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/92781466782.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/57153904637.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc05c4c06b---tamivebusimafopineve.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/fabit.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/jomosipawulufifigowoxasep.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD646 17240 bytes
SHA-256: 05bb1c3f5f6696b8f2dd16d280a09f1c6656ebef8201447c5c1f6c23d37863f3
font_01_sfnt_off0000efbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBC 17876 bytes
SHA-256: 154cabfe9d8655944c8ab1d4ef2a76e6b0a34f22169da621cb6fecf577d193da
font_02_sfnt_off00011e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13632 10972 bytes
SHA-256: 0a94636a2aee3265514292f13fb183d0fb85d95767ed4100f0f66d562dffc360

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