Malicious PDF — malware analysis report

Static analysis result for SHA-256 92439c672e3e5644…

MALICIOUS

PDF

77.3 KB Created: 2021-03-19 23:26:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 9c5d51d3d50677c04a8010193331acd9 SHA-1: 5b5159d1ae749729a73ac4ac07348df9077f3af7 SHA-256: 92439c672e3e564462b13530ad460bc1083d9bb101be80daf4a22f7a947eb070
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. ClamAV and ML heuristics flag the PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the presence of numerous external URLs suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://seumenha.ru/123?utm_term=spring+constant+lab+manual PDF link annotation
    • https://bijufipenonovo.weebly.com/uploads/1/3/4/5/134529550/gewofova.pdfIn PDF document text
    • https://jafipununevov.weebly.com/uploads/1/3/0/8/130814040/kazew.pdfIn PDF document text
    • http://vivaxuza.iblogger.org/tozijilibatukij.pdfIn PDF document text
    • https://sinekagu.weebly.com/uploads/1/3/4/8/134855021/mulepo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nowuzapifara.rf.gd/chambal_ki_kasam_movie_songs.pdfIn PDF document text
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_777d6c43579146a4874403b7e642fb9d.pdf?index=trueIn PDF document text
    • http://zimemotom.rf.gd/godumovumodawowuxuzowuluk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fafb13e7-f5fc-4cd6-a56e-c8822d34cf84/which_of_the_following_statements_regarding_citing_evidence_is_true.pdfIn PDF document text
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_fc8a566ae3eb496bb1610c5058205ab8.pdf?index=trueIn PDF document text
    • http://ronagonisewa.epizy.com/43775881793.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47fe3957-0e76-437c-afd6-4ecff882e918/fusinasufigisile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3918859-1274-4874-9de8-24287f4b89dd/medicaid_doctors_in_grand_rapids_michigan.pdfIn PDF document text
    • http://guwupurog.epizy.com/how_do_spaceships_overcome_gravity.pdfIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_ce7900c6cff24bc8996cdfa60d98c765.pdf?index=trueIn PDF document text
    • https://05f6fcc2-a4c7-4d5b-b58c-97b640a93f4d.filesusr.com/ugd/74147a_403d9d1a8430469f98c9c4438aace10f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e994abda-7eec-4f19-955c-e574680e4f6c/7557395043.pdfIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_e14509632adc404c8ac72af692bfc3b6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f74dd965-b7d1-4842-9a20-e162d73112b2/2004_g35_transmission_fluid_check.pdfIn PDF document text
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_e0abd9768ea340caafdcbefe18234f1a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9516c09d-e0d2-45df-82a2-f9c944584f7c/buvefowowe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cca9ae6c-beca-403a-a048-b63bf81507e1/what_is_difference_between_domain_model_and_class_diagram.pdfIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_c2def740d23c4a9d9f232fece2f9e703.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 5496 bytes
SHA-256: fdca3b0ab93e044a23d6c804b62cf0cfea969f02c88894f4ad1715201372ba27
font_01_sfnt_off000100d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D4 11076 bytes
SHA-256: fcd7d0c313a2bb6715dd34d97dfc72c16c7baa724527f9dc746147ac115ce68a

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