Malicious PDF — malware analysis report

Static analysis result for SHA-256 f386bb49b7b09af2…

MALICIOUS

PDF

74.8 KB Created: 2021-03-01 08:15:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 5f202b1b2342ef13cfc427e419293aa7 SHA-1: e0ec5e511ec2de6bd2bcac1e5a566afc664687ec SHA-256: f386bb49b7b09af256669c96ed5ecfa614de33a9fe92da8a47e45c3f6f1f970b
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. It contains numerous embedded URLs, with the primary one being 'https://seumenha.ru/strik?utm_term=urdu+english+dictionary+app+for+mobile', suggesting a phishing lure related to a dictionary app. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for such lures.

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://seumenha.ru/strik?utm_term=urdu+english+dictionary+app+for+mobile PDF link annotation
    • http://nubenukarerira.22web.org/ccleaner_pc_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496853/normal_60121f831965c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450639/normal_60309c86e29d1.pdfIn PDF document text
    • https://zidovularirijap.weebly.com/uploads/1/3/4/7/134718784/d9ca2eabb89f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466661/normal_5fe3add8e8065.pdfIn PDF document text
    • https://risovokoxenixe.weebly.com/uploads/1/3/3/9/133997247/306403.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365612/normal_602dd811b1dd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493209/normal_600fb1b95c479.pdfIn PDF document text
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/nupalu-puzudojipo-ponowusemute.pdfIn PDF document text
    • https://dinofewujib.weebly.com/uploads/1/3/1/3/131379591/ronalirawu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393016/normal_5ffea7121b718.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369773/normal_60235fa5cb0ce.pdfIn PDF document text
    • https://sizasoko.weebly.com/uploads/1/3/1/3/131384227/sulujikepa_lotar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://doriponesarom.myartsonline.com/55546104962.pdfIn PDF document text
    • http://vetarobafawuk.epizy.com/pofasifasarevudegos.pdfIn PDF document text
    • http://limoxukuk.atwebpages.com/78291924471.pdfIn PDF document text
    • http://koxowideza.epizy.com/15367625149.pdfIn PDF document text
    • http://zobadobu.epizy.com/fumiruvuzusetepenixafa.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_off0000e633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE633 5800 bytes
SHA-256: 37c81a517259036482b4ee49c560181e7377a69c33c5d147430b5b680ce8e48c
font_01_sfnt_off0000f9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CE 10412 bytes
SHA-256: 558639c4b3b096e5116e9b7b30805c77fe4763eb33c7ebc1afc1955ddbccab62

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