Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58edd565839ce6a…

MALICIOUS

PDF

73.6 KB Created: 2021-01-30 13:31:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 276c64963abb5e0f368c1a02155520e8 SHA-1: 36fa7815edab92f7c579ad5cadebe45fc918d0cd SHA-256: f58edd565839ce6a1fdcb247a0f4d57a6929dcf89164a75ec113e33caa0c3ec3
134 Risk Score

Malware Insights

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

The PDF document uses a fake invoice lure to entice users to download a malicious file. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous external URLs, many on disposable hosting, suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://seumenha.ru/aws?utm_term=tax+invoice+template+without+gst PDF link annotation
    • https://cdn.sqhk.co/busanurutar/heF8ErN/animals_in_winter_kindergarten_lesson_plans.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476429/normal_600e06d86bc79.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/eXjfjg7/nigerian_worship_songs_mp3_download_2019.pdfIn PDF document text
    • http://confirmationhelpcenter.com/42603277203if6tf.pdfIn PDF document text
    • https://cdn.sqhk.co/zonakagud/ggp9wjj/stacky_bird_hyper_casual_flying_birdie_game_online.pdfIn PDF document text
    • http://sacredname.ru/aprender_a_tocar_guitarra_electricaflurc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375351/normal_5fd2e9dd982b6.pdfIn PDF document text
    • http://kindraretterath.com/dungeon_keeper_3_war_for_the_overworld_descargarcwv0a.pdfIn PDF document text
    • http://ttttrrrr.space/78327044335bxy0e.pdfIn PDF document text
    • http://voztrans.ru/5487636535g0nuu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413975/normal_5fdf2dc0de554.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/haEigpQ/nukikukenomuterado.pdfIn PDF document text
    • https://cdn.sqhk.co/mofipife/ohciCih/coin_master_cheats_android_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479688/normal_600b4da82b183.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
    • https://s3.amazonaws.com/rakabexozu/budukaxoxudamiruvisujijuf.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/mapleroyals_paladin_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/ronud.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/47117305034.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_off0000d70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70F 5304 bytes
SHA-256: e77bbe485e14b13b0d4cb900ae388b0484d82fefd57e520429a50eb057e54e6b
font_01_sfnt_off0000e904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE904 9988 bytes
SHA-256: fefabe55e2dc3d0567810c58b215d7b6c4a2f1f57ef72188047f497f7b88ea41
font_02_sfnt_off00010af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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