Malicious PDF — malware analysis report

Static analysis result for SHA-256 42df385d659d9e6d…

MALICIOUS

PDF

78.4 KB Created: 2021-05-07 02:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f9583c178ade57d3bfc8a71f69bed2f7 SHA-1: 5afaafe128338ac43f730e187ada5d2644f1d447 SHA-256: 42df385d659d9e6d465aa4ffd2854ddf5dc44b90a064acaedd7d75dd795e0bd5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9992

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://soxebez.ru/strik?utm_term=the+importance+of+being+earnest+play+length PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405467/normal_601526be680be.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikagisato/8FjaMxN/pokemon_tcg_on_iphone_x.pdfIn PDF document text
    • https://cdn.sqhk.co/javomekoru/b5hdiUz/sivagojot.pdfIn PDF document text
    • https://cdn.sqhk.co/remavaveso/qifggii/subway_runner_game_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484097/normal_601fe07104715.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391008/normal_5fda7a3c42e7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493597/normal_601ad5856c036.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491410/normal_606c32eb2e766.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/hSV05mj/ximezu.pdfIn PDF document text
    • https://cdn.sqhk.co/xekutenupi/iLVXC6x/word_finder_with_letters.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488806/normal_5fe8a85bddf1a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375196/normal_5ff64d24346b0.pdfIn PDF document text
    • http://topikufovumedar.iblogger.org/demozirofiruj.pdfIn PDF document text
    • http://nezidilaginu.iblogger.org/16301031826.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzagile/haLfhia/electric_trains_factorio.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/itNigjj/gosesijevejewele.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tasetexogop.epizy.com/netgear_wn_3000_rp_reset.pdfIn PDF document text
    • http://xejosegapib.rf.gd/how_to_set_the_date_on_a_citizen_eco_drive_watch_e820.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/salovulinunazameki.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/bavurulatev.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/pejuf.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/how_energy_is_transferred_through_an_ecosystem_from_organism_to_organism.pdfIn PDF document text
    • http://rimuvuvipimube.epizy.com/milk_and_honey_book_collection.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/3528238712.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_off0000f337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF337 5620 bytes
SHA-256: f0fa78b8a2c3eda16374f2403952498946787c2868c450d8d92ad00b3014e51f
font_01_sfnt_off0001062f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062F 11184 bytes
SHA-256: 88b8d847263a2ada7e251f0a4ff3de0243c60e68bbcaf9abad06a18c82b446cf

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