Malicious PDF — malware analysis report

Static analysis result for SHA-256 675d418958db0ee5…

MALICIOUS

PDF

88.2 KB Created: 2021-02-18 05:29:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6b1a58f0ee773ab4288a942e9aaedf65 SHA-1: 456fbfe7c12afd8acee9ef38c5977e419370eb9a SHA-256: 675d418958db0ee528688d88d46bc7f15e6a827f0aef7e00eb3f132097fb0826
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to drive traffic to various websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful content.

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://jottigo.ru/aws?utm_term=how+to+downgrade+ps3+to+3.55 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4422367/normal_5fe4ea44ee385.pdfIn PDF document text
    • https://xudarusutovupaf.weebly.com/uploads/1/3/0/8/130814591/zafufesewomomi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497395/normal_5feaf05d53bb2.pdfIn PDF document text
    • https://cdn.sqhk.co/gesafafo/jgggiaf/biteram.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484375/normal_60230807b301c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405186/normal_5fee2580eb6ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369779/normal_6023ba5b091a0.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/FxpBgd8/bibireg.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuzigup/PtibNH1/grid_photo_maker_for_instagram_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477138/normal_601a70a29955e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/popilo/why_is_my_fios_router_blinking_blue.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/rawegafekuxukizebinu.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_off00011e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E23 5468 bytes
SHA-256: e96405f7cab01c687c9e50ed4520b72987a1958edef885c176681d6caca34e60
font_01_sfnt_off000130e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E4 10436 bytes
SHA-256: 08ebfb3a81ca9102738b4f6b3380ec0d38e4863834002b1c43b4d95f2578375d

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