Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f4492da2d86a98…

MALICIOUS

PDF

91.5 KB Created: 2021-03-14 21:43:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ca5d01d07ed92620ba14ed3566998a88 SHA-1: f9a8aac1111cb22f3294bf7fefffd026ae8b3a6a SHA-256: 35f4492da2d86a981513af983379413a4942a99fa4151574dacdab804c596c08
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs point to various PDF files, likely intended to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/wix?keyword=skyrim+mod+ineed+-+food+water+and+sleep PDF link annotation
    • http://invitesistem.ru/linux_system_programming_download5v24m.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/hfjgggQ/tunakogumomofapapawepeve.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/BfIYjaL/zefugogari.pdfIn PDF document text
    • https://zipakodexosif.weebly.com/uploads/1/3/5/3/135344546/vilakoni_xisedabaruriku.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/fQhjijb/62890122707.pdfIn PDF document text
    • https://cdn.sqhk.co/zoribakim/tjgtibW/gazegejuxaxamelibivupud.pdfIn PDF document text
    • https://nevofegef.weebly.com/uploads/1/3/4/8/134851200/5034254.pdfIn PDF document text
    • https://jijoforupet.weebly.com/uploads/1/3/4/8/134864875/pulazomo.pdfIn PDF document text
    • https://nolulanulupu.weebly.com/uploads/1/3/1/3/131379612/2266847.pdfIn PDF document text
    • http://creampiepow.club/the_lady_with_the_pet_dog_settingi7l79.pdfIn PDF document text
    • https://pemiliruvobavex.weebly.com/uploads/1/3/0/7/130739389/visatofojiwe.pdfIn PDF document text
    • https://bajipupetezin.weebly.com/uploads/1/3/5/3/135315063/tovewirejoj.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/ZkcidMd/board_game_subscription_box_uk.pdfIn PDF document text
    • https://kowevufewes.weebly.com/uploads/1/3/4/3/134388306/konojokolifato-vexelige.pdfIn PDF document text
    • https://xominamoluz.weebly.com/uploads/1/3/4/3/134319977/rurimuwawesoxeka.pdfIn PDF document text
    • https://xofudafitigo.weebly.com/uploads/1/3/5/3/135327781/tezebutigezin-piluxosalumipez-gesam-rofusiwep.pdfIn PDF document text
    • https://pevolevu.weebly.com/uploads/1/3/1/6/131606362/4b35e83ce947a.pdfIn PDF document text
    • http://raisinsapp.pro/7824665404uooy.pdfIn PDF document text
    • https://seruborakumew.weebly.com/uploads/1/3/4/8/134849990/gowalimedile_laxenob_julan_vukosuvagadevi.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/desenaz/greater_noida_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/big_hero_6_full_movie_tamilrockers.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/a_plus_certification_study_guide_free.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_off000126c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C2 5580 bytes
SHA-256: 28ca42eea704148933873e8b597eb75950437753c05794c1269d185d15d17c1c
font_01_sfnt_off000139ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CA 10884 bytes
SHA-256: 8041c3232f86cf6b9385a0537861e9e84e2b4202ae8f088416751167b93861e2