Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9584f7ace0edd8e…

MALICIOUS

PDF

69.7 KB Created: 2021-04-01 01:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 5275083cf9612b67719df49a9b3f3579 SHA-1: 597e2016d948b21efd7c164da535af98ee3289da SHA-256: f9584f7ace0edd8e00268ffc4b4df98e5777cff18eb9dea1a5e0f2476d7eb63d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains and employing UTM parameters, indicating a likely phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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://bologen.ru/strik?utm_term=piano+adventures+adults+2 PDF link annotation
    • http://getsol.xyz/keurig_-_35_k-cup_coffee_pods_drawer_storage_-_blackd4wbv.pdfIn PDF document text
    • http://goproits.com/zanoregeduvemikotuh206n.pdfIn PDF document text
    • http://boxberry-24.cc/eastwood_tig_200_manual6uhf9.pdfIn PDF document text
    • http://pumba-timon.space/6448155736890ae6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389601/normal_605bf31f07a86.pdfIn PDF document text
    • http://wuramegojuluz.mywebcommunity.org/tabla_de_alimentos_ricos_en_fibra_soluble.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393035/normal_5ffdb9b61e44d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376127/normal_5fd0e62e84cbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379837/normal_601e031a24561.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463785/normal_5fe3d58e84bc9.pdfIn PDF document text
    • http://creamwalls.space/how_do_you_hard_reset_a_samsung_tabletri05y.pdfIn PDF document text
    • http://xilexevu.scienceontheweb.net/btelinx_diploma_results_2020.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/all_about_periodic_table_of_elements.pdfIn PDF document text
    • http://dirtygirl.fun/97104744665e0wgg.pdfIn PDF document text
    • http://ericksandoval.com/lord_of_the_flies_chapter_11_and_12_questions_and_answershvhwu.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/682ea94a-979d-4c47-9170-eff8c14ad66f/the_quran_in_english_audio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b012db20-1383-4e2e-a2aa-3f0c1f921c1f/2010_chevy_malibu_ltz_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e885ef23-f267-40ac-802c-b14f4ba540be/how_to_calculate_power_in_parallel_circuit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c12cb04b-d582-479e-b7e3-9779e52156dc/turtle_beach_px4_pairing_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aa78a58-6076-477c-aea4-9ccfb649c71d/weruvovupazixitoduseza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b9ae2d4-625d-459f-beab-e17efb5369ef/14533175304.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeed09dc-fad3-428a-be41-b2c51408451c/gokoxenijumaxukelegirozi.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58C 5012 bytes
SHA-256: 17952a518f2a50c06204ec47b2d6dcf5ccb2e94a218996b0bd26a504f6dfa059
font_01_sfnt_off0000e6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AE 10212 bytes
SHA-256: 864f3e2e3bcf2b71dbf5941aca01194084aabbc742bcb419e2103b1288de06b8

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