Malicious PDF — malware analysis report

Static analysis result for SHA-256 174e6a59dfe0df00…

MALICIOUS

PDF

93.1 KB Created: 2021-04-01 07:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f3645b970376f574ca8e673e8a9fd1cb SHA-1: e6b5a6bbfddacf14fe15243e1149aac80a7d3fc6 SHA-256: 174e6a59dfe0df00bcd811698662acb03f9d559f3253c2950861d468ee41e7c4
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://golowaki.ru/strik?utm_term=the+secret+life+of+the+american+teenager+season+4+episode+14 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459060/normal_603db3633f2e2.pdfIn PDF document text
    • https://cdn.sqhk.co/vusunuvaka/OyjdjaH/analog_tv_transmission.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443803/normal_603c05b609530.pdfIn PDF document text
    • https://cdn.sqhk.co/tadanopi/z1o5jh2/logo_quiz_game_level_20.pdfIn PDF document text
    • https://cdn.sqhk.co/zinumazak/eQZuhdu/95992879944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492892/normal_600ce22cb69a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494433/normal_5ff9df1669f0f.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/37kfjcp/wumuxaliduvuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405206/normal_601916cbc74dd.pdfIn PDF document text
    • https://cdn.sqhk.co/kisoxukapab/e6y1icq/20690989722.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420934/normal_6038119a8e6ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/wigugekaram.pdfIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_c1b9a1130d3c41349864d79b02822271.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a591b46c-646d-43b0-98e6-5fc2ea6ed1e5/36034965764.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1de33e57-a0da-439a-8491-d656ed69e2e5/remington_11-87_shotgun_serial_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abad1b0e-9e74-413d-8b08-529cb463361e/virginia_woolf_orlando.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/bipagovexodanev.pdfIn PDF document text
    • https://b416d2a3-330e-4518-8f5e-c931256b4cd1.filesusr.com/ugd/5168b2_318f4ca59cf948eeb4f095cb0a7b13ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xefejevife/find_fault_with_crossword_answer.pdfIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_e998245f261b4d9f9a1e87a2453bfb61.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/backup_software_for_android_to_pc.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_off00012cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB2 5656 bytes
SHA-256: db7359d01b263dd452d33b6862c7d1619cfb50ef0e482079cfa195a6e4a453df
font_01_sfnt_off00013fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCB 11808 bytes
SHA-256: cc98635c6fa177ebff38d0fcde1315958827fe145fd072ed58b255005330470e