Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3cb189fab6fba5…

MALICIOUS

PDF

86.4 KB Created: 2021-09-20 05:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0ca26f6d805e495aedcf92725a9cc66f SHA-1: fd5d420c39fd78b95bb1c1c28b5172bad9fbc452 SHA-256: 1a3cb189fab6fba5053b485c77c243611f714a185152a998994befd8f38d0a31
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing or tech-support scam, where the document likely prompts the user to call a fraudulent number. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to deceive users into initiating contact with an attacker.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/gupog.pdf In PDF document text
    • http://maskaevlawyer.ru/userfiles/file/pibiwinexetekegax.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/80269938235.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/vozogipowexiter.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/ponenipeta.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130811578ac8---45926973157.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/nojefateboxewajedabudeta.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/kuveluxelanuxodejujupa.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/89863852819.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/65029753089.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/fibozokusoliwakelofoz.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/vasenatidogaw.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/jadex.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/wefizujevebob.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/60668905115.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/wozeponavivisifiro.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/21371153674.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/1f662629e56406a3dcd3fab4fdbe04de/85665463309.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/88805734058.pdfIn PDF document text
    • http://halanmilk.com/upload/files/4226825706.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/22463135585.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/bizisuges.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/xizulufonogajiped.pdfIn PDF document text
    • https://kenadong.com/contents/files/42456681644.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/2299825109.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/wawun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=redmi+note+10+5g+vs+mi+11+litePDF 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_off0000e904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10116 19024 bytes
SHA-256: f5b75ddda9a8b7d2774613aac513e21398efabc774e3f19766d7331056dccd4d
font_02_sfnt_off00013321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13321 10748 bytes
SHA-256: 7d1090230b7da18a8610c2d4c91065814a22f4db7216a9e2f62245cb294cdfc4