Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fb3c71315d8d94…

MALICIOUS

PDF

82.2 KB Created: 2021-03-20 20:25:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffa1986ad15badd662a63ddefca5dfab SHA-1: 5007107ea87f403fd532fd6f65019f4cc3bef111 SHA-256: 73fb3c71315d8d947cb78710445b8c3398cac73e743a7bdef459ff29a76511b1
126 Risk Score

Malware Insights

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

The PDF contains external URIs pointing to suspicious domains, including one that appears to be a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/strik?utm_term=sears+progressive+canister+vacuum+parts
    • https://static.s123-cdn-static.com/uploads/4491945/normal_5ffc48b24dfcf.pdf
    • https://cdn.sqhk.co/wezupobuwab/nLupbhd/crazy_football_plays.pdf
    • https://cdn.sqhk.co/popuzanuguw/g1evkre/bupodota.pdf
    • http://autobaff.xyz/through_abandoned_the_refuge0nssh.pdf
    • https://cdn-cms.f-static.net/uploads/4380867/normal_605278b820b4b.pdf
    • http://nobizifawuzim.iblogger.org/xudesavopebifaseti.pdf
    • http://ladyso.ru/bimuramovagedexofafelih9fqf.pdf
    • https://cdn-cms.f-static.net/uploads/4369307/normal_600abd84a532d.pdf
    • http://effektzhizni.ru/craftsman_shop_vac_bags_4_gallonj8tt4.pdf
    • https://cdn-cms.f-static.net/uploads/4381104/normal_60419e45dd355.pdf
    • https://cdn.sqhk.co/xexisini/DzmjheI/10918879719.pdf
    • http://zamuxodub.22web.org/how_much_does_a_certificate_cost.pdf
    • https://cdn-cms.f-static.net/uploads/4470837/normal_5fd3930931bb6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/071123e3-b0ef-4449-b0fd-b5bed0f164ad/top_10_finance_books_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/99e2ea95-fd2d-4f9c-ad7b-78d549f19249/gusatakowos.pdf
    • https://s3.amazonaws.com/boduxatavepe/4990961064.pdf
    • https://uploads.strikinglycdn.com/files/f8d7a1bc-3e4f-4fba-8543-f834c7c47454/kusebo.pdf
    • https://uploads.strikinglycdn.com/files/0254c841-2ce4-4232-8021-9432cbf6c38f/data_communication_and_networking_ppt_free_download.pdf
    • http://wetedezowob.rf.gd/cleopatra_ceramic_catalogue_2018.pdf
    • https://s3.amazonaws.com/mujevubutukoxu/the_power_broker_caro_kindle.pdf
    • https://s3.amazonaws.com/pajukovuxetu/bibexupifexevuwi.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_off0000f944.bin
ee5ec3d1cf4a70c9951482aa51614c8eeab1b12cca4465a50e580378e309e739		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF944 5264 bytes
font_01_sfnt_off00010b15.bin
6bdd37d67e35e76d3d4c8d66271feb8b7b533d2b2fe3fafeaee8f56e143a22bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B15 10016 bytes
font_02_sfnt_off00012d67.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D67 4324 bytes

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