Malicious PDF — malware analysis report

Static analysis result for SHA-256 fedbc16c8c7cf58c…

MALICIOUS

PDF

72.8 KB Created: 2021-02-25 07:52:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 10a8cb35e624610ca7029401822fbe65 SHA-1: 001e72bf099c6cdfd397d3e3d6e9994a5eddedad SHA-256: fedbc16c8c7cf58cdd4c42ddcd027fd88b4deae61a726536bffcfd842119a4b1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous external URLs pointing to other PDF documents hosted on disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of a link farm and external URIs indicates a likely spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://leonvi.ru/123?utm_term=carrier+debonair+220+installation+manual PDF link annotation
    • https://duzareledibasa.weebly.com/uploads/1/3/4/8/134890493/6397262.pdfIn PDF document text
    • https://lugekovatisemo.weebly.com/uploads/1/3/5/3/135337030/646172.pdfIn PDF document text
    • https://vomifudumapo.weebly.com/uploads/1/3/5/3/135345338/rugubanozib.pdfIn PDF document text
    • https://bonuxomudod.weebly.com/uploads/1/3/2/8/132814593/kazasefajutib-gomebo.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/6L8Vay4/60297978100.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/diablo_3_switch_2_player_one_console.pdfIn PDF document text
    • https://vejanozamafiz.weebly.com/uploads/1/3/5/3/135351199/37ea8e4.pdfIn PDF document text
    • http://didazema.mypressonline.com/67318759766.pdfIn PDF document text
    • http://firstreadersclub.com/youtube_how_to_use_power_pressure_cooker_xluvayg.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/can_you_bake_pizza_in_a_toaster_oven.pdfIn PDF document text
    • https://cdn.sqhk.co/gupuwiwi/4qyith0/bezozixarisaluzabolabeje.pdfIn PDF document text
    • https://faxipanonuk.weebly.com/uploads/1/3/4/3/134352952/7546754.pdfIn PDF document text
    • http://gojawufeki.getenjoyment.net/past_perfect_present_perfect_exercises_with_answers.pdfIn PDF document text
    • https://radufogerexe.weebly.com/uploads/1/3/4/2/134265868/wegobezodow-movop-rerisikogu.pdfIn PDF document text
    • https://fofonameg.weebly.com/uploads/1/3/4/5/134522304/fifororinekeva.pdfIn PDF document text
    • https://cdn.sqhk.co/zodozane/hb1igqo/51050216427.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nabenejajoko.myartsonline.com/how_to_clean_graco_swing_cover.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_off0000de0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0C 5292 bytes
SHA-256: e325d4d81db7fb818413d9c1c70557126c149d128b48b6e4098346059c7aefd3
font_01_sfnt_off0000efea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEA 11156 bytes
SHA-256: 6e9af7c5dc29ae17cb9ca14b9d290a7dea514ca823e8d241b0b42e5f452de0f5

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