Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f40f5ed8c96038…

MALICIOUS

PDF

78.5 KB Created: 2021-05-07 03:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0501dc85435830f36d37391e79694211 SHA-1: 707307c3ffc01e081fc69b00a8830f76c626a69b SHA-256: 88f40f5ed8c96038fa86f32b9a2b61ce4a4b6547c46a7b0065c92bb60a461ede
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 0.9996

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://midufefew.ru/strik?utm_term=did+sports+illustrated+have+a+swimsuit+issue+in+2020 PDF link annotation
    • https://cdn.sqhk.co/gogojiranat/ijiijjD/46656924856.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/new_headway_beginner_teacher_s_book_4th_edition_free_download.pdfIn PDF document text
    • http://sadipize.scienceontheweb.net/46107662524.pdfIn PDF document text
    • https://cdn.sqhk.co/fulaxanew/icmCphH/streamlabs_chatbot_timers_not_working.pdfIn PDF document text
    • http://poverkavoda.website/55787117924svdxq.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/hbibhgc/87528995614.pdfIn PDF document text
    • http://wide-take.top/the_divine_comedy_book_lovers_lyricsvm9rj.pdfIn PDF document text
    • http://difuwikikum.iblogger.org/empirical_distribution_function.pdfIn PDF document text
    • http://jofijuke.22web.org/33398892385.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wozurusezop.rf.gd/vesopamagafufonisixe.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/vetojuninixezenidup.pdfIn PDF document text
    • http://monawob.epizy.com/the_artist_s_way_morning_pages_journal.pdfIn PDF document text
    • http://lidagigum.rf.gd/atlas_copco_ga_90_parts_list.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/39454843468.pdfIn PDF document text
    • http://kevusej.epizy.com/kuwenoririjamodu.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/75367250244.pdfIn PDF document text
    • http://zegiwewezenaro.myartsonline.com/ralefu.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/refimezov.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/fopamanelinebagogozas.pdfIn PDF document text
    • http://bevivose.rf.gd/how_long_is_pretty_little_liars_on_netflix.pdfIn PDF document text
    • http://xovijoj.epizy.com/cannibal_holocaust_full_movie_hd.pdfIn PDF document text
    • http://kovobopejuwego.rf.gd/zavibaxubera.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_off0000f0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F2 5624 bytes
SHA-256: e30105209d9600be5fe89cd8cdc7b51e3d639182fc128adca6ebf47386aae5b1
font_01_sfnt_off000103fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FD 11452 bytes
SHA-256: d6371e1c84b0180dc12bbde9460b5b25acdd3165d89bd46de7aab318828ecd1e

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