Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc7fbadf013184b…

MALICIOUS

PDF

75.4 KB Created: 2021-03-19 19:53:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a394837e4445b927f59b9ab9344286af SHA-1: e90ca32da905293479101f525cf877765fb84296 SHA-256: bbc7fbadf013184b14767e23803da315a9ac056aecea7555697e38a7d1e7ca0f
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The heuristic firings reveal a mass of external links, suggesting a link farm or a method to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/strik?utm_term=where+are+forged+in+fire+knives+made
    • https://dafalozurevibi.weebly.com/uploads/1/3/4/3/134308304/2761255.pdf
    • https://cdn-cms.f-static.net/uploads/4462694/normal_602ff6dc2810f.pdf
    • https://cdn-cms.f-static.net/uploads/4462374/normal_5fd79e94ebf24.pdf
    • https://static.s123-cdn-static.com/uploads/4407997/normal_5ff89c4bb696a.pdf
    • https://static.s123-cdn-static.com/uploads/4410201/normal_5ff3dadf2fca6.pdf
    • https://golajowedobaxa.weebly.com/uploads/1/3/4/3/134308052/povivabuwa-sugatore-lilobag.pdf
    • https://cdn-cms.f-static.net/uploads/4451368/normal_5fd92bf204cd4.pdf
    • https://cdn-cms.f-static.net/uploads/4387244/normal_5fd0dcbf1e0ac.pdf
    • https://static.s123-cdn-static.com/uploads/4381752/normal_5fdf4560e28f9.pdf
    • https://static.s123-cdn-static.com/uploads/4406482/normal_5fdfb5a425a52.pdf
    • https://bodupojuribun.weebly.com/uploads/1/3/4/7/134758420/sulozazul-mubekalirodo.pdf
    • https://cdn-cms.f-static.net/uploads/4403808/normal_604fe592c8ebe.pdf
    • https://static.s123-cdn-static.com/uploads/4368246/normal_5fefcef8b2c44.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dbdf92fb-dd44-4d63-b590-2b47cc6cdec1/graco_contender_65_convertible_car_seat_safety_reviews.pdf
    • https://s3.amazonaws.com/waxegatulo/xajufasurubev.pdf
    • https://uploads.strikinglycdn.com/files/bb18f33f-b3e9-47a9-8fa5-3f44d0f266ce/50330647660.pdf
    • https://uploads.strikinglycdn.com/files/752e9437-f7da-4c59-ba6a-72d5f0f83154/20107222207.pdf
    • https://s3.amazonaws.com/mutirexa/wudamox.pdf
    • https://uploads.strikinglycdn.com/files/6e75534c-2f21-4c58-8dcc-11974faab75a/86175183858.pdf
    • https://uploads.strikinglycdn.com/files/160759cf-d06a-499a-8017-77f745f8f179/bozukubasujilarifavafomol.pdf
    • https://uploads.strikinglycdn.com/files/7884365d-0c0f-48fa-9cec-33d3ffeabe71/xiduboxilorewimoni.pdf
    • https://uploads.strikinglycdn.com/files/b6fb8957-91db-427d-81fc-10b08c25ee7d/ramuzigefutibeve.pdf
    • https://uploads.strikinglycdn.com/files/db3941a0-c5ee-4cb9-85cc-c9c1c9704308/miller_spectrum_375_x_treme_specs.pdf
    • https://s3.amazonaws.com/gedesisumi/kayn_guide_op_gg.pdf
    • https://s3.amazonaws.com/pajeriramal/ios_app_store_apk.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_off0000ea53.bin
d2eb8b1c6bda2c038de3dfc024bccd21aecdd758608aad85646aee2a891efc1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA53 5428 bytes
font_01_sfnt_off0000fcb2.bin
9d99ebda156427301cf5282006606a2bdf4baf90cd7aa553aa2f5b914b1b518a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB2 10396 bytes

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