Malicious PDF — malware analysis report

Static analysis result for SHA-256 52cd1ab640f11a0d…

MALICIOUS

PDF

105.2 KB Created: 2021-03-27 16:18:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bd23566020cba241086e6c26f3964e45 SHA-1: 22006763d5a4ac829121ab1a2e34b6248b8d04ba SHA-256: 52cd1ab640f11a0db466913ffbd7a02a1d7f0d985d045500cdbc6a4792385599
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of external links, flagged as a link farm. One of the URLs, 'https://vilenefex.ru/123?utm_term=carnival+phantasm+opening', is directly associated with the malicious verdict. The presence of a link farm suggests an attempt to direct users to potentially malicious or deceptive content, possibly for phishing or SEO manipulation. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/123?utm_term=carnival+phantasm+opening PDF link annotation
    • https://cdn.sqhk.co/kejaxedusuk/gIxtjep/68452953974.pdfIn PDF document text
    • http://hookup157.site/resimopiberottq3wt.pdfIn PDF document text
    • http://ketousa.site/gout_guidelines_australiafdbbp.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/Kdpihaz/3145783381.pdfIn PDF document text
    • http://krepezh.guru/93570696370afiem.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/ehx_attack_decay_manual8mscq.pdfIn PDF document text
    • http://tonerinkstore.com/153041352548imcg.pdfIn PDF document text
    • http://mazers.fun/satanael_persona_5_fusion_guidet51c1.pdfIn PDF document text
    • http://natikolom.site/acid_base_reactions_titration_curve_worksheet_answershryzt.pdfIn PDF document text
    • https://cdn.sqhk.co/juvowisire/fTzv8zU/94190075853.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/HbhijgK/aasld_hepatitis_c_treatment_guidelines_2017.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aa85aa2-7de7-47fb-97e6-6269af0fc4d5/how_is_energy_passed_through_an_ecosystem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ac716ba-2797-4844-b653-ab5ea6f02fe6/music_theory_practice_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/300fd887-751e-431f-a1dc-67e414fc357a/dumulexexijubixijava.pdfIn PDF document text
    • https://04650017-3ca5-4b28-9d9b-11da2816551d.filesusr.com/ugd/aa03de_d529ec3f16284d08b1dda03b53849fcc.pdf?index=trueIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_9b912a1573c5471fb20cd0f0a7c22976.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5270acd-07b9-43ca-8e74-9bb275000b7c/revefon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb66f54f-3e8d-4bdd-b5d3-09337533d8ec/ck100_key_programmer_manual.pdfIn PDF document text
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_531e7bab5453473696506831bc6937fd.pdf?index=trueIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_a77944d6bc97499f83cf8eb2d83af483.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e096afb4-3304-44cf-84db-e414926e4018/child_of_god_song_crowder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/051c6592-ac5d-42d2-9ed2-91c31035d98f/lorelimaz.pdfIn PDF document text
    • https://ab0007c4-58ca-4db2-ab23-686bae4d53c1.filesusr.com/ugd/8bf248_5505f9453a744d15a1e6081ac6e6429c.pdf?index=trueIn 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://scripts.sil.org/OFLIn 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_off0000ed60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED60 28296 bytes
SHA-256: 2a23b9fc58078a46864c85f83c78ed3d0952d80b63d42a986c6e80166953964b
font_01_sfnt_off0001461d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1461D 5200 bytes
SHA-256: 7128cf04bacf3352e6468ad6e8e3d1b56ebf3c8afe8d55cdb3ba3f6de64f76e6
font_02_sfnt_off000157a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157A4 12744 bytes
SHA-256: c869f442cf963c5f3c6da5f4be00985bd6bc42469d34121b955abb642b5ee22d
font_03_sfnt_off0001800e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1800E 16132 bytes
SHA-256: ca0bb856d51d4c440eb4e48db524e4b4a87bf80294704eab3ae97752e74326e1

Open this report in the interactive analyzer, or submit your own file for analysis.