Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d1ef35bfc9cf6e…

MALICIOUS

PDF

102.0 KB Created: 2021-03-13 23:02:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45f537480deb42588b992cc5456995a9 SHA-1: bc53e8d657feafb14c2e738a47754d18c90d2cfb SHA-256: 54d1ef35bfc9cf6e7d494bba56cbff02c028272506286fb6c71b079b5c8f9584
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, indicative of a link farm or phishing lure, as flagged by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/wix?keyword=arcane+mage+legion+guide
    • https://cdn.sqhk.co/juzurupivepo/tieq6ja/how_do_i_sync_icloud_contacts_with_gmail.pdf
    • https://cdn.sqhk.co/kuzosexiwugu/ghgjva8/slacker_movie_poster.pdf
    • https://cdn.sqhk.co/satidaruxami/jhxhbKL/58773021325.pdf
    • https://cdn.sqhk.co/mipijotom/ggie8ji/30884219813.pdf
    • https://cdn-cms.f-static.net/uploads/4426954/normal_602aa1dbbc2f8.pdf
    • https://cdn.sqhk.co/fetedudi/jaIjdig/mordheim_warband_skirmish.pdf
    • https://cdn.sqhk.co/dukoredod/hiheqOS/cartoon_slices_of_cake.pdf
    • http://tiwigibafofovit.iblogger.org/zurazaxewogijuxuzeputeru.pdf
    • https://cdn-cms.f-static.net/uploads/4414164/normal_5fd8e311d0036.pdf
    • https://cdn.sqhk.co/zitedefew/nMGggia/kujabisovused.pdf
    • https://cdn-cms.f-static.net/uploads/4450883/normal_600f750f649a7.pdf
    • https://static.s123-cdn-static.com/uploads/4409420/normal_5fc9b03d4734f.pdf
    • https://cdn.sqhk.co/vewukiziwemi/idGqFF0/solomon_s_keep_2.pdf
    • https://cdn.sqhk.co/pubamegumox/htfqe1q/aflac_group_wellness_claim_forms.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_a16ed1ad6b584cb39eaae1efda9f37d0.pdf?index=true
    • http://ruzoguniwu.epizy.com/terubukizoruxom.pdf
    • http://rolezudebozi.rf.gd/borland_c_builder_6_developer_s_guide_download.pdf
    • https://504706c9-3a86-45eb-876a-6494ef133fff.filesusr.com/ugd/80c1db_a95ecf586f3d468d9224b2d9152141a2.pdf?index=true
    • https://s3.amazonaws.com/jitimesolagun/4340386591.pdf
    • https://s3.amazonaws.com/midipes/assam_rifles_new_uniform.pdf
    • https://s3.amazonaws.com/liwara/mcb_internship_report_2018.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_off0001539c.bin
680cbf3793ee909d0cc75784187da730245fe4b71145355c067825fd9fef9ebc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1539C 5068 bytes
font_01_sfnt_off000164bf.bin
111aec83004a6ce8749ee8444a124e3e81d1b7f606a4a421b437f060bb48f039		 pdf-font-stream PDF embedded font (sfnt) at offset 0x164BF 11348 bytes

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