Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9ef104ae357834…

MALICIOUS

PDF

76.5 KB Created: 2021-03-12 14:23:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 034b1ef3498bae44daf4f9cd2d3e5427 SHA-1: d92ba230d37dc6d812c4047a45b94ecbf02eebf5 SHA-256: cf9ef104ae3578349dd0ff6cbbcc89b9f107509e4b60cf49f4430bd4080c89c7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a heuristic specifically identifying a 'PDF link farm' suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the presence of embedded URIs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=what+are+the+limitations+of+genetic+testing
    • https://cdn.sqhk.co/jifigetuxu/hjTjfpV/rottweiler_dog_images_hd_free_download.pdf
    • http://foyou.store/magpul_ar_15_handguard_rail4l2gd.pdf
    • https://cdn-cms.f-static.net/uploads/4476436/normal_602c08e12c678.pdf
    • http://rawiduti.medianewsonline.com/axe_fx_2_metal_presets.pdf
    • https://cdn-cms.f-static.net/uploads/4471273/normal_60102991ad273.pdf
    • http://clubstore.pro/realm_grinder_builds_2020lyyr9.pdf
    • http://loneresel.mygamesonline.org/33351783645.pdf
    • http://shopmzm.site/49706118926y3get.pdf
    • https://cdn.sqhk.co/mikevoponage/sjNicjd/fijorasaxibirogame.pdf
    • https://cdn.sqhk.co/kevekelobivo/jjaU7WV/16029949327.pdf
    • https://cdn-cms.f-static.net/uploads/4458625/normal_6014be0e6a45b.pdf
    • https://cdn-cms.f-static.net/uploads/4446390/normal_5fd9adb054bfe.pdf
    • https://cdn.sqhk.co/rabataxuvax/ibpD9ST/how_to_draw_a_simple_ice_cream_truck.pdf
    • https://cdn-cms.f-static.net/uploads/4458125/normal_60174aa51c032.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wupiwupiwot/68415532381.pdf
    • https://s3.amazonaws.com/sixolose/what_is_the_structure_of_writing_an_essay.pdf
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_bfe8696108244d67a656c6f75d7c0154.pdf?index=true
    • https://s3.amazonaws.com/zumezeviwakiz/1949468390.pdf
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_27e2943424b54b33b406755563a748e9.pdf?index=true
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_0e26f484c4e14461b5d77adf7f1bca4c.pdf?index=true
    • https://s3.amazonaws.com/setikizo/29638357493.pdf
    • https://s3.amazonaws.com/luropi/58695916370.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edff.bin
4d28df82f9123743c6a94c01496fb965880db6a29552329ddf39a263009a7e4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 5308 bytes
font_01_sfnt_off0000fff2.bin
b1247c1011fb49a4d8780d7ac8503f600331e9def790b0b9befb26ac2231e512		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF2 10776 bytes

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