Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0b03d45a3d52ab…

MALICIOUS

PDF

73.1 KB Created: 2021-03-02 07:35:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: c3f985171d04f361571580a5f184389c SHA-1: dce82260b7f8876a9a37a05f7a74697e2bc4848e SHA-256: bf0b03d45a3d52ab9b1459b13f3f6589b025765ea478546ad2e716055c01c8ec
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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/123?utm_term=lista+verbos+regulares+en+ingles+mas+usados PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485321/normal_6030ff97cf8c3.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/6jjhbhi/xmeye_dvr_password_reset.pdfIn PDF document text
    • http://tuvawom.iblogger.org/xifukekigimatixipal.pdfIn PDF document text
    • https://cdn.sqhk.co/rumobotituda/Wgjdjfz/81289970601.pdfIn PDF document text
    • https://poximixej.weebly.com/uploads/1/3/0/7/130776069/76ac5e74bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388177/normal_6013bd9836d28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443341/normal_60243404b9d02.pdfIn PDF document text
    • https://divetuguwopad.weebly.com/uploads/1/3/0/7/130739619/sojogav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379970/normal_602b60d1a225f.pdfIn PDF document text
    • https://nelizozab.weebly.com/uploads/1/3/0/8/130874358/2859312.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503584/normal_600ad723360f6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wipojijize.rf.gd/multiplication_chart_1_12_printable_with_answers.pdfIn PDF document text
    • http://pibusobi.epizy.com/kcet_2018_physics_answer_key_set_c.pdfIn PDF document text
    • http://rofixalo.epizy.com/bedroom_eyes_full_movie.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_off0000dddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDF 5284 bytes
SHA-256: abafb69b86cbf1671c4126ae39b95d5d0c32a40007e7de345dfa546c2a89a538
font_01_sfnt_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 11720 bytes
SHA-256: ebf20857632311cc2e8dad34331efd144844e422e3e45986e2a5a5591406530b

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