Malicious PDF — malware analysis report

Static analysis result for SHA-256 1389ea833681f81e…

MALICIOUS

PDF

81.1 KB Created: 2021-05-21 08:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c2de324376c428cfe826478af0bb5e40 SHA-1: 5d8be8845a19f8ee4037efa7cf000c85f17bccc1 SHA-256: 1389ea833681f81e8f4139adb6eb138a68e17a25caf4bf8c9d4c1b116a0f5c78
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, with one prominent link pointing to a URL that appears to be part of a link farm or SEO manipulation tactic. ClamAV and an ML classifier identified this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://leonvi.ru/strik?utm_term=samsung+wireless+lan+adapter+wis09abgn+walmart PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376379/normal_60257b4763d79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460060/normal_601fc9ac25758.pdfIn PDF document text
    • https://rutikaxa.weebly.com/uploads/1/3/0/7/130738846/lasupikuz-situvuremu-lakizo-kiziwafu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455374/normal_5ff78da6994d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407749/normal_60548ab22c3d1.pdfIn PDF document text
    • https://gopogusefivow.weebly.com/uploads/1/3/1/4/131406686/1701549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454982/normal_5fe775a2577f2.pdfIn PDF document text
    • https://wikaxefukefep.weebly.com/uploads/1/3/4/5/134519338/bafakawetibibi_kobavusugim_ritajigavo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379222/normal_6065db9a16bce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412909/normal_5feb5c8bf3373.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/7b6c1c50-575e-4694-8c19-751727cbfce6/tegipunozonolap.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/connect_android_phone_to_portable_dvd_player.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b42e952-fd31-4961-80ee-76b905a4d768/how_to_place_doors_in_piggy_build_mode.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/21704990389.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/kujovuboxuda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa32ceae-2166-4669-8f70-b11e7856a297/fomobomudigiriputer.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/wijakozikinixut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/687ebd66-f9cb-4434-ba0e-daf24db55916/mowerefinavawutenugo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/693664e1-641f-4eeb-9c4a-08dc980bc1c7/93308104855.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd6acb9b-15ac-44cc-8eaf-e399b492b31f/zenalesafedexelejek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/171de5b6-c845-48c6-8ee6-e80b038ef9ad/botururomavesofinaw.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_off0000f726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF726 5912 bytes
SHA-256: 8b79358e76e6fd481c89aa6e65b9a9bac5d60c9397dbc05d48991e21645d2ed7
font_01_sfnt_off00010b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2D 13864 bytes
SHA-256: 4b349129a47f5b72a7c70ca6bc166fcbac9c8432bdcb4cc68de1ba8a721ef02a

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