Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c03df798f697419…

MALICIOUS

PDF

87.1 KB Created: 2021-05-22 15:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ddb7c0a7e7bba8c74fc425756d051c9 SHA-1: 292b632b22c4434549256debcc7dc1cd8f0470bf SHA-256: 1c03df798f6974196b9f9f96caf15d2e80f4156563bf90cddc3cbeba6995ca36
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external URIs, 'https://nipisod.ru/strik?utm_term=how+to+connect+jvc+bluetooth+speaker+to+laptop', is suspicious. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=how+to+connect+jvc+bluetooth+speaker+to+laptop
    • https://jozufibajas.weebly.com/uploads/1/3/0/9/130969385/xulowaneweru-wuzaned-geniba-daresevesokepu.pdf
    • https://cdn-cms.f-static.net/uploads/4449001/normal_603fd91ece327.pdf
    • https://gizukazirup.weebly.com/uploads/1/3/4/4/134443136/4be7bbdf9eb0.pdf
    • https://fumitosebajogo.weebly.com/uploads/1/3/0/7/130740118/2085514.pdf
    • https://cdn-cms.f-static.net/uploads/4389376/normal_60503e12c082b.pdf
    • https://cdn-cms.f-static.net/uploads/4402721/normal_60244182dbb49.pdf
    • https://cdn-cms.f-static.net/uploads/4383561/normal_6013643ae71e3.pdf
    • https://static.s123-cdn-static.com/uploads/4380869/normal_5feec71a37c16.pdf
    • https://zumikifekov.weebly.com/uploads/1/3/0/8/130813997/849640.pdf
    • https://cdn-cms.f-static.net/uploads/4385413/normal_5fd6331e17f2f.pdf
    • https://cdn-cms.f-static.net/uploads/4403276/normal_6031363d1e214.pdf
    • https://cdn-cms.f-static.net/uploads/4384463/normal_5fd92f5cc8854.pdf
    • https://gavevuroboba.weebly.com/uploads/1/3/5/9/135959422/7851281.pdf
    • https://vozuviwugil.weebly.com/uploads/1/3/2/6/132681927/mugiwi.pdf
    • https://tigidejuremu.weebly.com/uploads/1/3/4/5/134502839/4278217.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pujirageg/gixeferodigabazo.pdf
    • https://s3.amazonaws.com/jebokizez/pecha_kucha_examples_education.pdf
    • https://s3.amazonaws.com/wazagidonux/100_day_action_plan_examples.pdf
    • https://s3.amazonaws.com/xukirizugukugi/75190109147.pdf
    • https://s3.amazonaws.com/woneketelak/schwinn_sidewinder_26_black_and_green.pdf
    • https://uploads.strikinglycdn.com/files/286457ea-67fe-4da5-bebc-db0b45dd6461/autocad_2016_free_download_with_crack_64-bit_filehippo.pdf
    • https://uploads.strikinglycdn.com/files/963e935a-cc6d-4939-abfb-b6db4b1c30d3/excel_urgent_care_nesconset.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_off00011662.bin
e67af051e0fa92d00dd9f83d40ce75c4f609d7f8470b1b88a7d089ea90f4e456
pdf-font-stream PDF embedded font (sfnt) at offset 0x11662 5416 bytes
font_01_sfnt_off000128d5.bin
d7cbce590489b9fc3f7f9b2bd7dd85be59996ff1b9b4f1e37385bc0dd216e5ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x128D5 11132 bytes