Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb45d983c834401…

MALICIOUS

PDF

83.3 KB Created: 2021-02-15 18:17:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 836fd2155b333202768141056e06147c SHA-1: 8abe818c0dd3af6b1a671ed5967f4dd90ed2df96 SHA-256: 3eb45d983c83440116985dd7da3c65b24f63c00775971c8b4affbf8860ebd346
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs suggests an attempt to redirect the user to potentially malicious sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://baarspo.ru/strik?utm_term=bioengineering+fundamentals+2nd+edition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484359/normal_6023fcb44c722.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502436/normal_5fe7bdd00c564.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445114/normal_5fe24e9b88e9f.pdfIn PDF document text
    • http://tevajevidiwa.22web.org/antidiabetic_drugs_classification.pdfIn PDF document text
    • http://gukimunejorupod.iblogger.org/honeywell_wireless_smoke_detector_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/vopovaroxamo/hhpxvic/tepuxitiduwexikojubuveke.pdfIn PDF document text
    • https://tefitosuwit.weebly.com/uploads/1/3/4/4/134478986/salulevazedemadakor.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nemidet.epizy.com/motokitowa.pdfIn PDF document text
    • http://sonasekofuxix.rf.gd/21507104819.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/free_bachelorette_party_scavenger_hunt_template.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e3f5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE3F5 12816 bytes
SHA-256: 4c2500b95e365c04b50bfba7278b010f34eafd12b74bb3d3261cb2dfd8b80b9c
font_00_sfnt_off0000d1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A3 5424 bytes
SHA-256: be1f3832fb272c99512f547f5b7fa74751a3f34745c4963bb9401919ff8b4884
font_02_sfnt_off00010894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10894 11236 bytes
SHA-256: b0313ddc35b6c40087aa179637ce88616d6632ec429cae2715a076e024e1dacb
font_03_sfnt_off00012ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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