Malicious PDF — malware analysis report

Static analysis result for SHA-256 66925f8367e58e3c…

MALICIOUS

PDF

82.7 KB Created: 2021-03-06 04:51:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: b91807dbec08bfaf523cc14d8650136d SHA-1: 306a419497495b0aa8cdda255b1c43ea3072ffd3 SHA-256: 66925f8367e58e3cf65990b0d48d9f874a5fb0ebe0d985ff42192383465c6324
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, with many hosted on disposable domains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/award?keyword=stanley+tre500+staples PDF link annotation
    • http://beach-fruit.fun/sazuladufuzotvo6m.pdfIn PDF document text
    • http://zisesir.22web.org/1874528479.pdfIn PDF document text
    • https://pofexetebi.weebly.com/uploads/1/3/4/5/134592759/4555f1aca4fc1c.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/buxufu.pdfIn PDF document text
    • https://suluxeposinugu.weebly.com/uploads/1/3/4/6/134634013/mutipef_mosivabus_ludoxese_pusitipesave.pdfIn PDF document text
    • http://cookwellbakewell.com/ncees_pe_test_resultshpamy.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/get_tough_approach_to_crime_definition.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/tiwepidonigu40u.pdfIn PDF document text
    • https://xikemusuvef.weebly.com/uploads/1/3/4/3/134322181/pumolegafivobe.pdfIn PDF document text
    • http://polnews.xyz/zombie_road_trip_hack8qnm4.pdfIn PDF document text
    • http://idealica-columbia.site/xibofatomavugizu3bw7m.pdfIn PDF document text
    • http://lenugaguv.medianewsonline.com/20637238109.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/762af2b5-7b6c-41fe-896b-f7a4100b3f88/88344350233.pdfIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_815de0b387e14672b2f52e744d307264.pdf?index=trueIn PDF document text
    • http://vudajerex.rf.gd/imf_report_2018_ethiopia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbc9e3c5-fe9e-4dd6-b123-7ac39d7bc9b5/clase_modelo_de_comunicacion_para_primer_grado_de_primaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8468e2f-2c31-4b1c-b194-a0942a5286ad/66605233027.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18aa1c0c-f30d-483b-b377-88265cb51856/route_vs_routing_protocols.pdfIn PDF document text
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_43c38d1e3fc94ed390740c2b9ca5e01b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8631019f-03ab-4ddf-b6a3-c584be54a47e/somewhere_over_the_rainbow_ukulele_chords_tuning.pdfIn PDF document text
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_8131b4ba240c4863a7a8551e9db9796b.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_off00010612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10612 5284 bytes
SHA-256: a21776b68cc9e38337f795712567f227690a6bccd99e4a5188ced24d5522b9c5
font_01_sfnt_off00011818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11818 11104 bytes
SHA-256: 3aa898f286af2e8be423a71784cce24455fda9efae18f2cccb1707a5147e7f19