Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90ef2adc050b08a…

MALICIOUS

PDF

86.7 KB Created: 2021-04-30 16:40:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5d34487ea05437f1702dcb484aa00071 SHA-1: 243ebfbaab3cb5e055124c71c59dd7856629dc9b SHA-256: f90ef2adc050b08aab3792c0ae66f93bbcdbb9472a66a20f3cfa9e2329cb8ed6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish for information. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these external URLs. No scripts were extracted, but the structure and numerous links point to a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://resalured.ru/strik?utm_term=why+is+my+carbon+monoxide+detector+beeping+every+40+seconds PDF link annotation
    • https://nekamijej.weebly.com/uploads/1/3/4/6/134633096/47ab4cd9f2d8.pdfIn PDF document text
    • https://cdn.sqhk.co/fusaduxuw/sggFPtq/papuwup.pdfIn PDF document text
    • https://nawexolaka.weebly.com/uploads/1/3/4/7/134704757/5e5f90e1554f0.pdfIn PDF document text
    • https://mofizuzu.weebly.com/uploads/1/3/4/3/134316779/kelowogojujekugojak.pdfIn PDF document text
    • https://cdn.sqhk.co/tezejikibus/Krjitjb/51816230853.pdfIn PDF document text
    • https://cdn.sqhk.co/denugesugumu/YPC4l1O/planetary_gear_ratio_table.pdfIn PDF document text
    • https://cdn.sqhk.co/figakeves/hhibPja/nursery_rhymes_baby_shark_1_hour.pdfIn PDF document text
    • https://tadizape.weebly.com/uploads/1/3/1/6/131637484/lasol_wajerafijexi.pdfIn PDF document text
    • https://cdn.sqhk.co/dikulodut/h6Wv7yV/43978709750.pdfIn PDF document text
    • https://xomepuwosabagef.weebly.com/uploads/1/3/0/9/130969083/nedom.pdfIn PDF document text
    • http://dopadogexegox.22web.org/bejolujiritega.pdfIn PDF document text
    • https://cdn.sqhk.co/guregame/shfH1ig/nexixupun.pdfIn PDF document text
    • https://cdn.sqhk.co/pemenixa/Hghiggf/kazimigunenoku.pdfIn PDF document text
    • https://cdn.sqhk.co/pigujoxexate/iegiuUZ/alfa_romeo_giulia_quadrifoglio_manual_for_sale.pdfIn PDF document text
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/e0185.pdfIn PDF document text
    • https://xelusivixofon.weebly.com/uploads/1/3/5/9/135958974/dumilejuvepezug_mopipizininitu_tanogup.pdfIn PDF document text
    • https://bagerukuvimi.weebly.com/uploads/1/3/2/8/132815916/zokopoxit_mimegagotajalu_kalofobiketa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wetoxikilosawa.epizy.com/49088269516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3646c658-09e9-4dd4-b9fa-c9aff4de37e1/maytag_neptune_dryer_mdg5500aww_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58db8959-eefc-4177-aaf2-24db16f25b48/tibiwomikanerek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6113faaf-8cc0-4612-a76a-bbf3fa0f7521/what_is_forbidden_in_singapore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72c025fa-d52c-41d6-aec1-5e59f0fd7ac5/zuvidalaxolaku.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10327 5856 bytes
SHA-256: 1ded76da37c27914c15aa602cf0d1138709cb630214b64b44f6410d34bcdbe0f
font_01_sfnt_off000116fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FD 11044 bytes
SHA-256: 7fbce08803f2139ade040d960558cc87962c743b69b52c1d0365c1d1c23081f3
font_02_sfnt_off00013cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD4 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378