Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b8947f83eabb30…

MALICIOUS

PDF

86.2 KB Created: 2021-03-28 18:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7ed3f3c1166afc84c067f25b6ad3a734 SHA-1: f350ea9dce565b45f965bdee29bed0dfd661f5d9 SHA-256: 56b8947f83eabb30ad15b321c676789757b68d1e0e86434467a10ff3a9db0241
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with one specifically pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a lure to download a second-stage payload.

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://vilenefex.ru/award?keyword=ansys+workbench+18.+2+tutorial+pdf PDF link annotation
    • https://cdn.sqhk.co/levowexesu/cjagjha/gamisagojerukiwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375361/normal_605213ee5e152.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/Aiijabp/video_player_pro_apk_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380881/normal_6049d79e914a4.pdfIn PDF document text
    • http://sipamuxagiporen.iblogger.org/jenazawun.pdfIn PDF document text
    • https://gurugurib.weebly.com/uploads/1/3/1/3/131384113/zatetogoguw_nozekelitadoret.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465402/normal_5fcbd7a065705.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_6025c3bcc6260.pdfIn PDF document text
    • https://namunobuwuper.weebly.com/uploads/1/3/0/7/130776476/5678842.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453108/normal_5fcfe743d9788.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wegudewabeko.rf.gd/epson_3020_bulb.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/telugu_old_is_gold_audio_songs.pdfIn PDF document text
    • http://tirevotijo.epizy.com/columbian_exchange_activity_packet_answer_key.pdfIn PDF document text
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_a7b0654d6136434eadd4a082fe3b9bad.pdf?index=trueIn PDF document text
    • http://tuxefofoxomar.epizy.com/gadukukudisewo.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/nootan_physics_class_10_icse_solutions.pdfIn PDF document text
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_a27b61ffe28b4804812023f55968575c.pdf?index=trueIn PDF document text
    • https://be9c8297-50e9-4ec8-be22-7cc4068ef96a.filesusr.com/ugd/fc3b0b_799b382845594c86877666c513300df8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mukutud/pegolipuvexakaz.pdfIn PDF document text
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_8ad3a56625164e33b4f1157d8e01a92a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gitipelut/munawitotavalinuvejo.pdfIn PDF document text
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_3aa69ac851e642518f3378a39ab4cc1e.pdf?index=trueIn 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_off0001066e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066E 6040 bytes
SHA-256: 225af2519918a2d2e2e478f3bfcf9e59034af89e7638c9d5edfb7308b2f22a7e
font_01_sfnt_off00011b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B25 15448 bytes
SHA-256: d3aa2f36aa5e2974b00e4fe39309f89e4c3893b59dda1d8ae9c06db37e218a4a

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