Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf3e8da319c1886…

MALICIOUS

PDF

84.6 KB Created: 2021-04-30 04:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8de55b576656d1d1b2c917d33d4ce14e SHA-1: 20977f600fd1b934404267cb6b31aa98c572e9e4 SHA-256: 2cf3e8da319c1886cd3a7491809648eaa76731192246ff036b633e9e780d37e7
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs pointing to disposable hosting, indicating a link farm designed to redirect users. 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 URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=how+to+find+mean+density PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410015/normal_5fe940fc1692d.pdfIn PDF document text
    • http://bovibuvebus.getenjoyment.net/adverbial_clause_list.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476135/normal_5fc770e76988e.pdfIn PDF document text
    • https://torimavilok.weebly.com/uploads/1/3/5/9/135984964/fazerileb-sevegiv.pdfIn PDF document text
    • http://fajafifog.mywebcommunity.org/fonuzozokozu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427509/normal_604218eb98662.pdfIn PDF document text
    • https://tafugamukizigip.weebly.com/uploads/1/3/0/7/130775106/d7ff6e8dce.pdfIn PDF document text
    • https://fopojikanerev.weebly.com/uploads/1/3/4/8/134888820/serej_kojuwu_fodewaw_dojabakizafexu.pdfIn PDF document text
    • https://cdn.sqhk.co/wevamerazo/e5zo9he/38016271207.pdfIn PDF document text
    • http://bobiruropiles.22web.org/68116738497.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwasokeg/Njce0jb/24845055540.pdfIn PDF document text
    • https://tubozabuzimez.weebly.com/uploads/1/3/4/8/134878922/rojatoza_gudof_fexeturusat_bufaxar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371536/normal_5fc8763cd2cfd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376621/normal_6007599953323.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366676/normal_603161dc2a616.pdfIn PDF document text
    • http://kibesamifi.getenjoyment.net/11186118640.pdfIn PDF document text
    • https://bejokezogakuji.weebly.com/uploads/1/3/2/6/132695802/1aa537a458fd7b0.pdfIn PDF document text
    • https://cdn.sqhk.co/sokulutesi/ggh5hhc/linkin_park_recharged_rar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419433/normal_6050416e65b2f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://legujajojozete.epizy.com/81059791302.pdfIn PDF document text
    • http://rawisafowusedum.rf.gd/40813621280.pdfIn PDF document text
    • http://wivoruremuwun.rf.gd/tamil_boldsky_apps.pdfIn PDF document text
    • http://gujimosodaza.myartsonline.com/amendment_in_motor_vehicle_act_2020.pdfIn PDF document text
    • http://pidusagi.atwebpages.com/abraham_lincoln_speech.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_off00010d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D67 5080 bytes
SHA-256: 6909e4070be0e659ff8e2312165701550009109125ea8946be9edba7f0177478
font_01_sfnt_off00011eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB5 11688 bytes
SHA-256: f220f11800a14f50c7bbe18d8124c6b3d53d2be1386524476df058013783b8c1

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