Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ff3accfec06cfb…

MALICIOUS

PDF

83.4 KB Created: 2021-02-04 11:07:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 545322aaf280307eb7affe3baa2709a7 SHA-1: 84b3ca4482c75695fa802cb3173b78fc797c7128 SHA-256: a0ff3accfec06cfb81d50842fe55d382042a211e403f7fddf9d0314029b31f0d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for link farms used to distribute phishing pages or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://leonvi.ru/wb?keyword=installare%20appvalley%20android PDF link annotation
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/6227423.pdfIn PDF document text
    • https://cdn.sqhk.co/navolakolire/SaIjcl0/29_card_games_apps_download.pdfIn PDF document text
    • https://cdn.sqhk.co/puberufibo/hiKKjhl/cat_jumps_over_gate_in_fascinating_way.pdfIn PDF document text
    • https://cdn.sqhk.co/lomokubaf/hh2hZii/69330202255.pdfIn PDF document text
    • https://dusoveri.weebly.com/uploads/1/3/1/0/131070325/5479985.pdfIn PDF document text
    • http://zoo-taxi.site/jetaselufatubagufexup08uxr.pdfIn PDF document text
    • https://makifilibavik.weebly.com/uploads/1/3/5/3/135383918/7aee402.pdfIn PDF document text
    • https://sixuvowapunara.weebly.com/uploads/1/3/0/7/130738553/wulavogijered.pdfIn PDF document text
    • https://vezitiratad.weebly.com/uploads/1/3/1/8/131856143/f2fff684d89976.pdfIn PDF document text
    • https://cdn.sqhk.co/waxigapo/3ijsha0/pakulifubewojasopabakur.pdfIn PDF document text
    • http://minomesiguziv.22web.org/93136270121.pdfIn PDF document text
    • https://cdn.sqhk.co/lidabofob/nJjeWgc/wafivojibikafaz.pdfIn PDF document text
    • https://medogizelolu.weebly.com/uploads/1/3/1/0/131070938/531916fab5e5a4.pdfIn PDF document text
    • http://mabay.fun/kixoburegazineilct0.pdfIn PDF document text
    • https://bipesulevawitod.weebly.com/uploads/1/3/1/4/131437914/nudugajijapom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xexerekiw.rf.gd/higher_geography_biosphere_model_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/anthropology_syllabus.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/26486408776.pdfIn PDF document text
    • http://palomidifigur.epizy.com/vojelaf.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/xonabosesagusozabamojab.pdfIn PDF document text
    • http://bilunijo.epizy.com/ashampoo_free_and_install.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/bangla_beauty_tips.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE603 5052 bytes
SHA-256: 493eaf7e869b8a090c36abc45eb85730b5d491f0e9ff7006a11ea439c309a936
font_01_sfnt_off0000f743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF743 2240 bytes
SHA-256: 8df3f9ccd97439faed37701afafebfce10b6635b3dee79f1737503a336f2b1d3
font_02_sfnt_off00010172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10172 12084 bytes
SHA-256: 22fb223879abcc7ddfc853eac436924e9548dd14a83832069f902fe2c48d157a
font_03_sfnt_off00012918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12918 16128 bytes
SHA-256: 7df9c757af567881a6ec1e901ed80cfbb3f6e307e96188de676cc30f15be1dd4