Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d9a94b19e39792…

MALICIOUS

PDF

88.8 KB Created: 2021-03-16 21:58:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: f49c08a96ff110e8ae99af9e6b888fc9 SHA-1: 224f59e43ad69346425585764f57325eafa37af0 SHA-256: 98d9a94b19e397927cdc53f98fc1eb66ecce6d7986b1f98bb428de8da76c72d9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the presence of numerous external URLs points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://vilenefex.ru/award?keyword=shadowing+japanese+pdf PDF link annotation
    • http://mekarafa.iblogger.org/phenylketonuria_journal.pdfIn PDF document text
    • https://vifiboreb.weebly.com/uploads/1/3/5/3/135349596/6802280.pdfIn PDF document text
    • https://xamikike.weebly.com/uploads/1/3/1/4/131406211/5344444.pdfIn PDF document text
    • http://bapatavusirave.mygamesonline.org/jowodimidizigugasuxa.pdfIn PDF document text
    • https://pasezarovatif.weebly.com/uploads/1/3/4/8/134858127/29e6b.pdfIn PDF document text
    • http://vebuwovivulab.mygamesonline.org/robuzesubobolopizilovaw.pdfIn PDF document text
    • https://nimediwajukijiz.weebly.com/uploads/1/3/4/5/134501673/6400566.pdfIn PDF document text
    • https://jasoveloxera.weebly.com/uploads/1/3/5/9/135967924/96c917a244f1d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dujizadixupodur.epizy.com/70847548017.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/26105972370.pdfIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_07b5e97318734a47b934240316b0885d.pdf?index=trueIn PDF document text
    • https://de7eff9d-5c50-4122-bb99-ee112abf7a8f.filesusr.com/ugd/db8f21_c4d99670b6aa43c399e49c918daf0ce7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/timex_miami_chronograph_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7796d0e-e5d9-47ab-8e95-5c324d5aaa70/breville_toaster_oven_problems.pdfIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_b1b5ff6be0944d5aa945feabaa7ce256.pdf?index=trueIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_4733913e1da64c3c88108e0ed5c3c2c8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dabatisew/bloons_td_6_iphone.pdfIn PDF document text
    • http://lanosewidem.rf.gd/39356332998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f34184ae-d7d2-4144-9357-fa3cadab7fdf/xuxelixanomuvaweremir.pdfIn PDF document text
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_db2659e89b6b48648bf627879351253e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/97028309397.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/c_sharp_interview_questions_and_answers.pdfIn PDF document text
    • http://pudugivifo.myartsonline.com/xivogizajuwalujana.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://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_off0000efaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAF 7012 bytes
SHA-256: a17b8d564621ae04aba957b248853d8a547508b5e718003157262f6453d665d2
font_01_sfnt_off00010781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10781 5444 bytes
SHA-256: b76b3330de487087f5a05f63b416cad4f4fe51a752fd9f9d64903b11003f78ab
font_02_sfnt_off00011a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A23 11164 bytes
SHA-256: 35bfdb1844ae775a16322738cd30c68ffd8237df44066e4696e39dc3ee6f578d
font_03_sfnt_off0001404d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1404D 16160 bytes
SHA-256: 31f54bf1b2a0bd5fcefce680aa7bc0ab7b2c48a0f9a6877104dd616c0c0a5462

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