Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b0c8079f8148f3f…

MALICIOUS

PDF

85.8 KB Created: 2021-05-02 15:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfae981e99f79ecc9fae8126dea510d2 SHA-1: d20666117164f8536f565cf3ab50e62020ee5534 SHA-256: 7b0c8079f8148f3f570a628131020b81ddcc75ef38063d0914809d058d3a1893
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://seumenha.ru/strik?utm_term=how+much+does+a+lexus+gx+460+cost
    • http://lixorajepidil.mygamesonline.org/zmodo_camera_setup_troubleshooting.pdf
    • http://noroxutapokuz.iblogger.org/rarowebod.pdf
    • http://nubuxeki.scienceontheweb.net/postpartum_hemorrhage_adalah.pdf
    • http://zajilakofudo.scienceontheweb.net/89489832244.pdf
    • http://gepanukotex.getenjoyment.net/cours_anatomie_appareil_gnital_fminin.pdf
    • https://manoxumumaxu.weebly.com/uploads/1/3/4/4/134472756/pepevidikizan_jepaxarugulavuf.pdf
    • http://jovedarike.iblogger.org/bankable_project.pdf
    • https://lewofadexireg.weebly.com/uploads/1/3/4/8/134868993/nobatobuzipekojilo.pdf
    • https://vonulimuwudepaf.weebly.com/uploads/1/3/4/1/134131723/puxeto.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_f6a714ba507e486093bc471037ade0b6.pdf?index=true
    • http://rulotib.epizy.com/48163661749.pdf
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_c2e51a2748ee4748899843cad2ea4933.pdf?index=true
    • http://nakolazuwesu.epizy.com/guramijimenonitivuj.pdf
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_da9ef63c18124b92ae876622b2105057.pdf?index=true
    • http://xaxuvep.epizy.com/25896291351.pdf
    • http://gekekuvowu.epizy.com/lumelelakogawiw.pdf
    • http://nanaxidimidi.atwebpages.com/zukejexuwepalosifuwegu.pdf
    • http://xinimegofuf.epizy.com/the_great_depression_and_the_new_deal_answers.pdf
    • https://a44a9d9e-3ce9-422e-9b5d-83ef2d4925cb.filesusr.com/ugd/3234e9_fdbc81bf2a3f418e88b05518b3a6e5e8.pdf?index=true
    • http://femadovasawexas.epizy.com/dosekilipenigowija.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_off00011276.bin
5a5d8e2d740d88fa7525132a719db9111f0570bfdcf1932c1d29fe67b7b88490		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11276 5760 bytes
font_01_sfnt_off0001260a.bin
aa6f3a4f851b7d66eb754dabd29d3bf4eb513349fb8501ec7d5768ed439294e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1260A 10496 bytes

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