Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c90a945a32c47a7…

MALICIOUS

PDF

74.9 KB Created: 2021-03-26 07:10:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09408dd20e355f542e40fa41f7cbc279 SHA-1: 76a9594f4ac8b112a6d0b5179daf9c907ca8fc66 SHA-256: 3c90a945a32c47a767e1aea94eb9e827eb6d2def5c9751f1a88bc7c0b8ab7599
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially malicious domains, indicative of a link farm or SEO spam tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further payloads. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/wix?keyword=pathfinder+kingmaker+calendar+in+game
    • https://tilinonulubun.weebly.com/uploads/1/3/4/6/134614078/4790917.pdf
    • http://vopukisavenif.medianewsonline.com/visual_agnosias.pdf
    • http://fidafevemikiwe.mywebcommunity.org/libros_para_superar_la_ansiedad_y_depresion.pdf
    • https://cdn-cms.f-static.net/uploads/4446492/normal_6040fbc483088.pdf
    • https://mamifonor.weebly.com/uploads/1/3/1/1/131163935/6ddf04e559d6236.pdf
    • https://cdn-cms.f-static.net/uploads/4405950/normal_6019271963d7f.pdf
    • https://static.s123-cdn-static.com/uploads/4379846/normal_5ff336bb754f0.pdf
    • https://jimilosebot.weebly.com/uploads/1/3/4/0/134096588/934844.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vukumesoj/seturawi.pdf
    • http://gevejonitu.onlinewebshop.net/flow_cytometry_first_principles.pdf
    • https://s3.amazonaws.com/mibiwivanetuj/que_tipo_de_gobierno_tiene_cuba_y_venezuela.pdf
    • https://s3.amazonaws.com/juzowilipi/94138021387.pdf
    • https://uploads.strikinglycdn.com/files/4e3ed24a-33b5-4f96-b36e-2bc35d55e3f8/whirlpool_duet_sport_washer_error_code_sd.pdf
    • https://uploads.strikinglycdn.com/files/087cd7d6-67a2-42ff-9552-f08b2ff9c685/74800946259.pdf
    • https://s3.amazonaws.com/gifiz/8540159043.pdf
    • https://s3.amazonaws.com/fukezavazuj/how_to_get_my_onn_wireless_mouse_to_work.pdf
    • https://s3.amazonaws.com/baxekojojexusol/64201720301.pdf
    • https://s3.amazonaws.com/jarirotexab/69322076620.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e90a.bin
42ed4782e05ad88938724272f9b849f73c41943a4e4ef52e296abf002fc437b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE90A 5324 bytes
font_01_sfnt_off0000fb00.bin
7a1646b6f78f61609d891885b6ca8c001b5e5bfdc0b8bd0bea7e2ae66b8746f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB00 10380 bytes

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