Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3df0264e3fb102b…

MALICIOUS

PDF

93.4 KB Created: 2021-03-09 08:58:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: c1966a635983fe7ccc64f43fc34c13e6 SHA-1: a3125a44be92dcfdc77ed041fd45048e85725c6d SHA-256: b3df0264e3fb102b7e68e12735bf00f3f06d0ffedffc4da4b26ceb7264098555
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily garbled, contains text related to learning French and mentions wkhtmltopdf, indicating it might be a lure for educational content to mask malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/award?keyword=apprendre+%25C3%25A0+lire+et+%25C3%25A9crire+le+fran%25C3%25A7ais+gratuit+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4422893/normal_6008bb9677a6f.pdfIn PDF document text
    • http://vapagugisozule.22web.org/boards_and_beyond_download.pdfIn PDF document text
    • http://lnstagram-office.com/what_is_cloud_computing_gartner9ocyc.pdfIn PDF document text
    • http://experiment.website/suxufolajewuxolin6ekob.pdfIn PDF document text
    • http://dokukuke.mypressonline.com/37926507712.pdfIn PDF document text
    • http://fokuwezowixo.iblogger.org/lofofetujabexosavalalot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454672/normal_6004efcaecccf.pdfIn PDF document text
    • http://ruxuzosok.mywebcommunity.org/dell_inspiron_3520_original_battery_price.pdfIn PDF document text
    • http://mebevevi.mywebcommunity.org/41556211463.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/61226016414.pdfIn PDF document text
    • http://karavaxix.iblogger.org/95776823357.pdfIn PDF document text
    • https://lujegasot.weebly.com/uploads/1/3/0/9/130969173/8c36e46747905.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489609/normal_6023061953c82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408858/normal_6032cef1000ad.pdfIn PDF document text
    • https://zememaxuzibur.weebly.com/uploads/1/3/5/3/135326459/bamidipamipefe-bivuvivobatuli-xokawib-tolasinafawuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_d9c9b4a888d646cea3539bf8f5f423f0.pdf?index=trueIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_a31e682bd35d4fe1993fae557d03dc4d.pdf?index=trueIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/27276674487.pdfIn PDF document text
    • https://9e6c4f0b-3406-4274-bf8a-5be7f948d240.filesusr.com/ugd/45c6ff_3938098834b04efba26d7525bf17d903.pdf?index=trueIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_ab78e86cfb9c40df8a0c0753527ae260.pdf?index=trueIn PDF document text
    • http://torowenakatum.epizy.com/boyds_remington_700_stock_review.pdfIn PDF document text
    • http://zawidapiwixub.epizy.com/bach_prelude_no_1_sheet_music_piano.pdfIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_3f65e828fe13476793e11243693a0b25.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_off00012881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12881 5872 bytes
SHA-256: e71e9e2d21979ad43d3fa85017d800f4ba7871ba9b61c00ebb8279e3bc619499
font_01_sfnt_off00013b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7B 13368 bytes
SHA-256: 501f7571bbb9fac2a8b43182846830999d41941c38fa3b414fd377799ecd6b26

Open this report in the interactive analyzer, or submit your own file for analysis.