Malicious PDF — malware analysis report

Static analysis result for SHA-256 691ff956499f0509…

MALICIOUS

PDF

91.6 KB Created: 2021-03-26 10:12:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 65d1144dc7a9dc5f0ac33e61fcbdbe72 SHA-1: 906ccc40314320dca8bd4d38f6d5fd3b3516f871 SHA-256: 691ff956499f0509c9a05c45cc903dfa8819eb774acc28331246163ecb69602b
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://jottigo.ru/wix?keyword=thinkertoys+pdf+espa%25C3%25B1ol PDF link annotation
    • https://loniforuwo.weebly.com/uploads/1/3/4/9/134904684/4536914.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450356/normal_5fe9ad9a21499.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/welipakizenubevunexugema.pdfIn PDF document text
    • https://viwosakizipisot.weebly.com/uploads/1/3/5/3/135321869/dexiraxowe_lixuxadazu_gilemujopiziwag_sajiwi.pdfIn PDF document text
    • https://sefubokadizafa.weebly.com/uploads/1/3/4/8/134880044/17620fd0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459621/normal_60121c2454248.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450248/normal_5fee45beb740b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459636/normal_5fc70db1d1dd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369912/normal_6046a7977b995.pdfIn PDF document text
    • https://nifogagerosore.weebly.com/uploads/1/3/5/3/135300162/6616e0d.pdfIn PDF document text
    • http://notanowid.22web.org/78039573383.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469849/normal_5fedeef55674a.pdfIn PDF document text
    • http://devivitonewe.sportsontheweb.net/29148298617.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455176/normal_6033286cbed51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476122/normal_6006d5a92ac68.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wixatax/mafoboforikarewidafukade.pdfIn PDF document text
    • http://juwovumul.rf.gd/83201679717.pdfIn PDF document text
    • http://bupagiji.epizy.com/vukewojukopaf.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/kogoxumalipodim.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/wedding_shoes_images.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/wobusutif.pdfIn PDF document text
    • http://laletanegimiw.epizy.com/android_broadcast_receiver_uses-_permission.pdfIn PDF document text
    • http://kewivifonawati.epizy.com/diwapazeba.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF715 7104 bytes
SHA-256: 3daf036783512fcb14d271d2de4c739553af0d59755db7247539c65d25830497
font_01_sfnt_off00010ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA7 5244 bytes
SHA-256: 689c7dd5f2b13d1007d60c326dc9e8d3a369fa379f482d2048b23708027539b3
font_02_sfnt_off0001202c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202C 15872 bytes
SHA-256: d433a4d6e4cefefa340320855e7bb93160deb9c497de0c88425d83859513347e
font_03_sfnt_off000150c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C4 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e