Malicious PDF — malware analysis report

Static analysis result for SHA-256 77369fc7eedaa383…

MALICIOUS

PDF

80.6 KB Created: 2021-03-14 15:10:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4110371303ddd81eea15cb5409950248 SHA-1: 58993cb7dc866a60dc1d0e4f68b1fdb699d4e244 SHA-256: 77369fc7eedaa3832eb3d152d6ad63170a9a48fb290257e92f9bd6d78e78e51d
126 Risk Score

Malware Insights

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

The PDF contains an embedded URL that directs users to a website with a keyword related to medical fellowships, likely a lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious content.

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://xezojetit.ru/wix?keyword=psychiatry+fellowships+for+family+medicine
    • http://zoompol.xyz/moxarudikorogijitadejijot6os9.pdf
    • http://xiwesesakuvel.medianewsonline.com/78248755078.pdf
    • http://tourist.fish/sonic_the_hedgehog_game_genie0idw5.pdf
    • http://bufezipuduxev.mywebcommunity.org/dominos_garlic_butter_sauce_recipe.pdf
    • https://cdn.sqhk.co/rirerujel/hfigwjb/capital_funeral_home_cemetery_nepean_on.pdf
    • http://bogplaktnc.fun/is_randomness_really_randomxow3p.pdf
    • https://cdn.sqhk.co/xewafazuk/iijfhcL/harvard_business_review_italia_download_2019.pdf
    • http://gazajujana.mygamesonline.org/hallmark_movie_unleashing_mr_darcy_cast.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1aea9e9c-11ed-46e5-9a7f-5d7059835d1a/rumiwesapokupeludamemetu.pdf
    • https://uploads.strikinglycdn.com/files/2ce221f9-7272-4d77-9dca-fe73541e7c30/what_are_the_4_types_of_claims_adjusters.pdf
    • http://zelubosomud.rf.gd/ffbe_esper_guide_2018.pdf
    • https://uploads.strikinglycdn.com/files/11e78618-800d-436a-9b0e-0c3fb940062a/ccna_security_exam_sample_questions.pdf
    • https://uploads.strikinglycdn.com/files/2d58ad78-f05b-4523-bcd3-00f1cfedbd93/supenam.pdf
    • http://vilobeve.rf.gd/curriculum_guide_in_arts_2.pdf
    • https://uploads.strikinglycdn.com/files/90e0121b-0fc3-4d30-ae83-91ef0af2f492/how_much_do_green_egg_grills_cost.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_off0000fa02.bin
c555087ab976914df1065e4492dc24219e93e4165e31c8ae9578e3d94274f414		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA02 5592 bytes
font_01_sfnt_off00010cfb.bin
9c6694f435d3a794243c776bed6ccc817eaeabc5a32b94c582cc08ca4e7e3f45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFB 12056 bytes

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