Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b62f88695fb588e…

MALICIOUS

PDF

70.0 KB Created: 2021-05-18 21:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 435f68d7b9645714ca607b7dfb2f5e29 SHA-1: bc770294349cb275b0e9b5541bc9f69482acd102 SHA-256: 1b62f88695fb588ed2f29111fb81907fbec65cf7c6d9dcbcdc629dd2756993c6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or scamming. The embedded URLs and the heuristic firings point towards an attempt to drive traffic to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/strik?utm_term=onn+tv+universal+remote+codes PDF link annotation
    • https://jitegolugitu.weebly.com/uploads/1/3/4/6/134643776/3243672.pdfIn PDF document text
    • https://suzagosezamonu.weebly.com/uploads/1/3/4/4/134446802/bavoxeja-wopelewuwedupi-diwabo.pdfIn PDF document text
    • https://sakojokotinij.weebly.com/uploads/1/3/1/3/131379540/puram-papiriv-vavulivepexaj-rurenuvorukedat.pdfIn PDF document text
    • https://zoviwifave.weebly.com/uploads/1/3/6/0/136053666/xegosovedu.pdfIn PDF document text
    • https://kaxozugusejerob.weebly.com/uploads/1/3/1/4/131452826/pelilu.pdfIn PDF document text
    • https://kaxamutibe.weebly.com/uploads/1/3/5/3/135348628/4824336.pdfIn PDF document text
    • https://molavose.weebly.com/uploads/1/3/5/3/135350427/fb956a597125b8e.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/wovigebi/reteb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2538dab8-1526-45f6-9bf5-83c0f214f0da/polycom_soundstation_2_conference_call.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bbbaa2c-f78d-4542-b571-85086a79638a/how_to_use_kenmore_top_load_washer.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/focusrite_scarlett_2i2_second_generation_2nd_gen_usb_audio_interface.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e639eae-1c18-4988-81cb-d6c4c8e844a8/the_adventures_of_tom_sawyer_1938_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c76c8423-2a2a-41e9-8db2-1a6953ffc993/nsw_foundation_cursive_handwriting_free_printable_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cd8889b-7fd8-4507-b565-d89dde4082f6/the_secret_life_of_the_american_teenager_episode_13.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb1f90e3-80c0-44d0-8837-7f0864e2d06b/xonakowago.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/wutolakazekelabi.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_off0000d7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A4 5172 bytes
SHA-256: 25129f0db6d8046f4ce2668840dfebfe62b4bbfab147859ad5fe4feae21a1c72
font_01_sfnt_off0000e926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE926 9996 bytes
SHA-256: 990df74516cf6b0ee3c10b85790a10352cfd3fc80a9663621a2821b514cff75c

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