Malicious PDF — malware analysis report

Static analysis result for SHA-256 e956795c7f63b72e…

MALICIOUS

PDF

94.3 KB Created: 2021-02-15 16:14:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9476b0e6394feb1340bfb67c9cab88df SHA-1: 74294bf12ea5487f2dd52a55472983efd4b8406d SHA-256: e956795c7f63b72e59884ee56a5b23d2e01c95b72a8630fd2aebfd02846303c2
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links pointing to various domains, many of which are hosted on disposable or suspicious domains. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to manipulate search engine results or redirect users to malicious content. No scripts were extracted, but the presence of many external URIs is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://maypoin.ru/wix?keyword=i+want+tv+ang+probinsyano+february+26+2018 PDF link annotation
    • https://cdn.sqhk.co/bozomixega/7if0jiN/us_history_quizlet_chapter_4.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/2k1Xkcl/anger_of_stick_4_mod_apk_techylist.pdfIn PDF document text
    • https://cdn.sqhk.co/pafitevet/z9Wyhjh/mountain_bike_racing_games_for_android.pdfIn PDF document text
    • http://rutenowataba.iblogger.org/concepto_de_equidad_e_igualdad.pdfIn PDF document text
    • https://cdn.sqhk.co/piwizogir/ebifjcc/46669687001.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/xovekolamoxe/sound_of_one_hand_clapping_answer.pdfIn PDF document text
    • http://pinavobanokewix.epizy.com/74695026668.pdfIn PDF document text
    • http://vufebadavoga.epizy.com/guided_transmission_media_in_computer_networks_ppt.pdfIn PDF document text
    • http://koxowasone.epizy.com/xujaxomususularibine.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/chronicles_of_darkness_interactive_character_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/71195761437.pdfIn PDF document text
    • http://zudosikewemer.epizy.com/livevuxegoriretumajuduru.pdfIn PDF document text
    • http://fasemejatafa.rf.gd/18653119597.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/18812694187.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_off000125ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AE 6040 bytes
SHA-256: 5366e752189443cfa7aefb0a18138168ef2731f9d9d927ada77d8effbccf2272
font_01_sfnt_off00013a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A74 15844 bytes
SHA-256: ffccd598f83a607aaf9288c6e7d32c79e780c3a047bdf25b7714ab8444e7b91f

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