Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d43b5a8386f4be9…

MALICIOUS

PDF

87.3 KB Created: 2021-03-13 13:30:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 890c6f78ed36fa227dd7e52093313e5e SHA-1: d0f768b2300edca374b920a317ebe8b3c3edf6af SHA-256: 5d43b5a8386f4be9a85baf32f0952ffc0833d34488d6ce06bfbd57a489eb60b5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URLs, many hosted on disposable domains, suggesting an attempt to redirect users to potentially malicious content or phishing sites. The presence of multiple PDF links and the use of UTM parameters in one URL further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/strik?utm_term=tomorrow+when+the+war+began+in+hindi+filmyzilla PDF link annotation
    • https://cdn.sqhk.co/ruretibot/Hg1ixgg/zedemun.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/hhhePyB/surazu.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/ixgdjaO/oxygen_level_chart_elderly.pdfIn PDF document text
    • https://wumudirega.weebly.com/uploads/1/3/4/5/134515906/2babe39539c2.pdfIn PDF document text
    • https://wawodupalise.weebly.com/uploads/1/3/4/6/134621762/de4fe7.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/ohfihOB/limisonatuvodoxudo.pdfIn PDF document text
    • https://cdn.sqhk.co/suwenadikum/iTgjtjd/neon_blaster_2_hacked.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/a0ibGmE/pc_3d_movie_maker_software.pdfIn PDF document text
    • https://cdn.sqhk.co/jalotenabo/djcjeoS/guparilifuwufakin.pdfIn PDF document text
    • https://cdn.sqhk.co/kefiruge/cS2VifI/grumpy_cat_good_night_meme.pdfIn PDF document text
    • https://wijirejilape.weebly.com/uploads/1/3/2/8/132816202/d451a73276405.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/db748629-5e00-4656-87a4-cb303f8d6e6d/samsung_rfg298hdrs_ice_maker_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/tenavowegiwofuzuleg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03763b72-6acf-42e0-b093-326bdebbed1a/pitaj.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/69693874452.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cbb48f6-897f-412b-b363-2fc5951a5855/33696234969.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/apple_support_iphone_guide.pdfIn PDF document text
    • https://deed868a-3c3f-4b0d-b3ae-f9ebe8a38c33.filesusr.com/ugd/95283b_834b0e1f5e3f487abb9e8904bbcad241.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/togumig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd8dcbeb-a64b-498a-a9a3-0c0b4baf3278/behringer_xenyx_x2222usb_mixer_case.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/fuzukevexugesuge.pdfIn PDF document text
    • https://e25b7b56-d8f7-44cb-9276-56428e53d1cc.filesusr.com/ugd/63f3e8_51b532ba7c334d9f9eb6441f0ac0515d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bae626b-5581-49ba-b666-5983745c8b6d/62428213475.pdfIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_2dc8298eaf294185a811d52cbafac854.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_off00011437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11437 5476 bytes
SHA-256: 0e9b80a18d151d84c19afeac3dedad87b947d36417760e0a6ca562497cf54e72
font_01_sfnt_off000126c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C8 11908 bytes
SHA-256: cd16fbd601a93acda0ef857eedb0c0f8fbba1c87f693901f6fdf7bb7b31cf753