Malicious PDF — malware analysis report

Static analysis result for SHA-256 1efdbdac9066b8db…

MALICIOUS

PDF

78.5 KB Created: 2021-03-31 03:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 9e0689ed988cf72bc31cff80838125b4 SHA-1: 554868c63db26c1d16f750861d9e7776a304ce9d SHA-256: 1efdbdac9066b8db85eb0ebfc9b12b1491ad486fa6e5d2b8cd8bd4a85cd1e8cc
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external domains, with a notable heuristic identifying it as a 'PDF_SEO_DISPOSABLE_LINK_FARM'. The embedded URLs, such as 'https://bologen.ru/award?keyword=applications+of+bioplastics+pdf', likely serve as lures to phishing or malware download sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=applications+of+bioplastics+pdf PDF link annotation
    • https://sizamuvexiluti.weebly.com/uploads/1/3/4/6/134644091/2689155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428341/normal_5fdc7be4ac010.pdfIn PDF document text
    • https://wunepilupizuxo.weebly.com/uploads/1/3/1/8/131857535/vevelejudadan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_604d3f42ec601.pdfIn PDF document text
    • https://bavusuma.weebly.com/uploads/1/3/4/2/134265942/798e1.pdfIn PDF document text
    • https://kasitawudak.weebly.com/uploads/1/3/1/3/131380619/a826dd0cc1ffa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421058/normal_5fe6160dc782c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406514/normal_5fc6a68c10a0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483602/normal_601a9c37b2cb9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://voxafizuvukulam.epizy.com/the_lady_or_the_tiger_minor_characters.pdfIn PDF document text
    • http://tetiduba.rf.gd/zawudijokugalaperoromuv.pdfIn PDF document text
    • http://munoxefarofow.rf.gd/xujiredexuxunudamumev.pdfIn PDF document text
    • http://tatinovewetede.rf.gd/mewedozuwobupoka.pdfIn PDF document text
    • http://mebagazedovozep.epizy.com/adjudication_vs_arbitration_canada.pdfIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_7cc660b4f0604a58b42690a45ce71146.pdf?index=trueIn PDF document text
    • https://2a984544-7cb8-4a4d-9f60-e686f7994e39.filesusr.com/ugd/1434d3_296f437ff9c8438bac7be1e9a0734f59.pdf?index=trueIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_afefa3c154ad4185b6b5248c3969c1f3.pdf?index=trueIn PDF document text
    • http://rofamotitasijud.rf.gd/damegovawiwakozugovidi.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 5184 bytes
SHA-256: c78ad7f869fa27d8cff32b554bced709b72d6e87cbf4c9b42fd5eb59ef5151db
font_01_sfnt_off00010606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10606 10936 bytes
SHA-256: 808d51f546c5e8a57bc6ae15a9d2c77dce2fc53153ddcc5d1e8bbd03ea5836bc

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