Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc94997f6a470d94…

MALICIOUS

PDF

74.5 KB Created: 2021-02-28 16:14:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 241327fb45efd1a92d92816122bf709e SHA-1: d53bf2626a7bd69257e6ec5f5f4a9b2db1384feb SHA-256: dc94997f6a470d945067f64f6e1a9b014e4361a91f92428eaaf8e6554c8b0028
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are associated with disposable hosting and are presented as download links for applications. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading unwanted software. No scripts were extracted, but the presence of external URIs and the link farm structure suggests a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://pelibifir.ru/wix?keyword=carx+drift+racing+hack+apk+download+ios
    • https://cdn.sqhk.co/fizuborugas/ghHZhgH/racing_drone_online_store.pdf
    • http://vannabanyavsedela.xyz/car_sounds_ringtones_mp34uxop.pdf
    • http://centerverifybadge.com/l_abominevole_sposaf5z04.pdf
    • https://cdn.sqhk.co/dixufeja/jWghZha/vikixevo.pdf
    • http://bestgirl69.com/star_wars_cantina_piano_sheet_musicsty8f.pdf
    • http://libralab.digital/84249356347873vp.pdf
    • http://revilokepudidu.mygamesonline.org/38813512614.pdf
    • http://anbieterbewertung-autoscoutch.com/phineas_and_ferb_christmas_vacation1xks6.pdf
    • http://wamuwosola.mygamesonline.org/bebivudokujida.pdf
    • http://jafoxidulez.mypressonline.com/mesalitekigoguzavisevu.pdf
    • http://rigudozefogo.mypressonline.com/garmin_dezl_570lmt_mount.pdf
    • http://gajaxujifusokul.mygamesonline.org/indian_veg_sabji_recipe_in_hindi.pdf
    • https://cdn.sqhk.co/papebikuwi/icYiA2q/lezokigubug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jobavo/whiskas_kitten_food_feeding_guide.pdf
    • http://fiforeru.atwebpages.com/nikovaxafe.pdf
    • https://s3.amazonaws.com/dupula/linexamepodeputozu.pdf
    • https://s3.amazonaws.com/zuxime/63316297433.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9d1.bin
7366c18e8c4ee0ab58bbc8e739c590e330ed38c01e984021ef2034c65d544020		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D1 5336 bytes
font_01_sfnt_off0000ec04.bin
091842fa4ca1cc4a960dac878dcfd2c97100819d8c3be25dc1bc7b23cc8ed320		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC04 10124 bytes
font_02_sfnt_off00010ec6.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC6 4324 bytes

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