Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b7681f0dee35c6…

MALICIOUS

PDF

72.7 KB Created: 2021-02-28 08:23:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 20ba6fec6773b4c6ba62adb5dc631f9b SHA-1: 99b1b29f56c4f31fa89ba6bbd3355705a9ee19ff SHA-256: f9b7681f0dee35c6f9ab676ba75167f582ecdbd7fb3f05fa3df79489189ffa81
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous small PDFs on disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/wix?keyword=solve+for+y PDF link annotation
    • http://rowowevu.mypressonline.com/81137696491.pdfIn PDF document text
    • http://dotavulilego.mypressonline.com/50459603453.pdfIn PDF document text
    • http://pidagenavuziw.mywebcommunity.org/all_american_pressure_canner_921_vs_925.pdfIn PDF document text
    • https://vakitepodedobi.weebly.com/uploads/1/3/5/9/135963574/9c34a7b3b7.pdfIn PDF document text
    • http://ragexerate.22web.org/48040357444.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/sunijixuvugebavisa.pdfIn PDF document text
    • http://wozasewu.22web.org/80337502658.pdfIn PDF document text
    • http://retamos.mygamesonline.org/where_can_i_buy_a_christmas_tree_for_cheap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://remosinidad.rf.gd/pajavomivobikezenes.pdfIn PDF document text
    • http://doriponesarom.myartsonline.com/1868021268.pdfIn PDF document text
    • http://puxedevonizu.epizy.com/32144498414.pdfIn PDF document text
    • http://pumajuxav.rf.gd/vufij.pdfIn PDF document text
    • http://tobikinos.onlinewebshop.net/tofevagorekerekukiwimom.pdfIn PDF document text
    • http://lojupefiduk.epizy.com/nupopinonutukuwofanipi.pdfIn PDF document text
    • http://jilevatawew.epizy.com/zojesiripujefowodumopa.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE393 4636 bytes
SHA-256: 35baee0cda1646e28fe849ac0fe5834af27d0e7e6aa8592a3c3b77b42603a523
font_01_sfnt_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 10236 bytes
SHA-256: be0a9ae8fed568b6efbf7dbf04221c1fd1ce034e1d7f3b1c7b7f439c49f11d91

Open this report in the interactive analyzer, or submit your own file for analysis.