Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40fe97325dd054a…

MALICIOUS

PDF

80.8 KB Created: 2021-04-04 20:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5b5a2d7e201fc11ec23d9237cdfe517c SHA-1: c6112a94f9942b6bd2c3f51f2e2ed714f9f4da36 SHA-256: a40fe97325dd054a29fa365eb80a858b0e8be6a8ccfdfa898cf8f901684c3a85
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URLs, with a primary suspicious URL being https://fokemale.ru/strik. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the link farm heuristic suggest the primary goal is to redirect users to potentially malicious or phishing content hosted on external sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/strik?utm_term=is+project+x+based+on+corey+worthington PDF link annotation
    • https://tajaleder.weebly.com/uploads/1/3/5/3/135320318/fopuma-tuvutesuvufa-dafakorogez-dalevoxudagisem.pdfIn PDF document text
    • https://robesiso.weebly.com/uploads/1/3/4/5/134501854/zasoxogirozoba_dokesezos_rinuluxonovoj.pdfIn PDF document text
    • https://xugimitedekilim.weebly.com/uploads/1/3/1/4/131482884/gewozawufaduzegimavo.pdfIn PDF document text
    • https://cdn.sqhk.co/xudadidi/gdifXIY/folder_sync_alternative_android_apk.pdfIn PDF document text
    • https://zofoxutugutijor.weebly.com/uploads/1/3/0/8/130874595/xozapifi.pdfIn PDF document text
    • https://joxefumisati.weebly.com/uploads/1/3/1/4/131406837/b2822be.pdfIn PDF document text
    • https://cdn.sqhk.co/simikimira/ehaidjf/farmington_first_umc.pdfIn PDF document text
    • https://cdn.sqhk.co/mavizosimefu/0MBSgfQ/alif_laila_story_in_english.pdfIn PDF document text
    • https://wotawodakel.weebly.com/uploads/1/3/5/3/135316359/lutebij-nuziladiliv-wuxesusa.pdfIn PDF document text
    • https://labifunuvi.weebly.com/uploads/1/3/4/8/134847398/8291256.pdfIn PDF document text
    • https://moxuronanupew.weebly.com/uploads/1/3/4/5/134597487/kudaxeva_dizelokagukerub_xanoge.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_2424a8d7fe004d2ba10e9c91b6a20c9a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/savifin/can_you_make_simple_syrup_without_sugar.pdfIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_38afd5b8033f41a9bf23970bc4dcc49c.pdf?index=trueIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_39b86cf4e5284211a0de5e69b8923315.pdf?index=trueIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_0423753cd75c4a3e90b99d742bb0b964.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fogibi/52779012457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d791f63-bb9f-4055-bed2-2197b54f0182/2005_honda_accord_v6_maintenance_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/endocrine_society_clinical_guidelines_testosterone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6a4dd33-9054-4347-b165-d8ce438c306a/tirogeboxuzufadidiwasis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d84b29d3-1059-49ae-878d-ef5d2ebcd9a4/machine_learning_with_r_brett_lantz_github.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57ecfc2d-2f16-442b-a10c-f9046af694cf/how_to_make_a_simple_lego_gun_without_technic_pieces.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfe411cf-0647-4f17-8034-b669115d3124/zejimomenenamifukuki.pdfIn PDF document text
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_a0a3c7e0aee04a6f8a7d99d0465bbbd9.pdf?index=trueIn 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_off0000f9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B3 5716 bytes
SHA-256: 3eceb5c00314f25b2591ee483fc79cf6f2fef72eaa88f3214023973adaf00bac
font_01_sfnt_off00010d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3C 11220 bytes
SHA-256: 8e5dc51cd878613ff02fef364aaf4a1e87f7d6d8798ad63a1cc2c7693fc884bd

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