Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c129e2508e45965…

MALICIOUS

PDF

112.7 KB Created: 2021-04-28 22:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0f4054e3ddd42649228716efe994537d SHA-1: e696664d0795ee8957051b653e6ab62e5db9bb91 SHA-256: 8c129e2508e45965738fdda400767e68b20e643ee3b1046edde7d6b6e6296829
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=backpacking+merit+badge+book+pdf PDF link annotation
    • http://pukebebizadolu.mypressonline.com/11228407470.pdfIn PDF document text
    • http://bitiwiz.medianewsonline.com/brochure_examples_for_travel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403672/normal_5ff01f53c5344.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427821/normal_5fede5952c98a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377109/normal_600c6f71bb780.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464539/normal_6022c3063c750.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/jjSijid/fopavaxizugabu.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/jdbEw0P/serig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470401/normal_5fec9fd74ba61.pdfIn PDF document text
    • http://davebamonuzove.medianewsonline.com/pepsina_funcion.pdfIn PDF document text
    • http://lebofawudire.mygamesonline.org/cd4052bd_datasheet.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzezufe/nmOegHN/babuji_zara_dheere_chalo_lyrics_song.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/ehbihM3/neo_marxism_for_dummies.pdfIn PDF document text
    • http://sijemogezabusa.sportsontheweb.net/94971999184.pdfIn PDF document text
    • https://cdn.sqhk.co/jadepibake/ijS7gdA/durevimimavinuduwefus.pdfIn PDF document text
    • http://kafalukuwemi.mygamesonline.org/1051241953.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b96759a-d765-4ace-835b-487c62f6febb/honda_gcv190_pressure_washer_oil_drain_plug.pdfIn PDF document text
    • http://jafixomedimun.onlinewebshop.net/cloud_affairs_pocket_august_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/engineering_drawing_layout_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/50113375184.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/rewiguzemato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c400f647-08c8-4ccc-a25b-a9cbd7204604/how_much_does_joist_pro_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/fafanojipojonedupo.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/purulixatuzefanilalamuku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82f569e8-07b9-46c8-85a8-6e765866450f/what_is_meaning_of_lateral_thinking_in_marathi.pdfIn PDF document text
    • http://kopolug.myartsonline.com/dekebevobela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adaddd8c-f403-432a-b63a-6ee5458ebe60/why_is_old_navy_shipping_delayed.pdfIn PDF document text
    • http://vilumepidiwego.myartsonline.com/netoxik.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001652c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1652C 5520 bytes
SHA-256: 98ac7b4e5024b3d27563c429d3e13240a523700e992fe6bc13b824707923c0c5
font_01_sfnt_off000177e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177E1 11380 bytes
SHA-256: e21c63f4333822fee7d5b992dcb80c9bc1ddee99799b4ba5d3925472a65bf241
font_02_sfnt_off00019f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F2B 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15