Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa57bbea31c72562…

MALICIOUS

PDF

73.6 KB Created: 2021-05-22 10:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bbfbb08dc98b78dbb729b98c2007c3e4 SHA-1: 9be6309df2aed9a5958bfc798eba923b7411b014 SHA-256: aa57bbea31c725623d0552b8a9e3eb0b0303663da0d290c46fa80f4f9b7fb2ce
186 Risk Score

Malware Insights

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

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 0.9991

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://soxebez.ru/strik?utm_term=o+alienista+caleb+carr+pdf+download+gratis PDF link annotation
    • https://worowisirokisid.weebly.com/uploads/1/3/4/8/134856274/3272961.pdfIn PDF document text
    • https://joguxakiwemov.weebly.com/uploads/1/3/4/7/134707067/19a4cad3.pdfIn PDF document text
    • https://litalegikuga.weebly.com/uploads/1/3/4/5/134587653/fozuvap.pdfIn PDF document text
    • https://movediwifed.weebly.com/uploads/1/3/2/6/132695881/xulubodo-nozadubomomekob-lipidosixin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450631/normal_6017649048da4.pdfIn PDF document text
    • https://vusimipemukebev.weebly.com/uploads/1/3/0/8/130814393/10923ae.pdfIn PDF document text
    • https://nitowapesapu.weebly.com/uploads/1/3/4/4/134442046/e5baec1a4.pdfIn PDF document text
    • https://kisofufenuvojuw.weebly.com/uploads/1/3/4/6/134628350/duvivo_vugaladibit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375907/normal_604d00692655a.pdfIn PDF document text
    • https://vepibasizux.weebly.com/uploads/1/3/1/3/131380915/ziwofakuboz-zugis-xaxiludob-ruzawegenufuwut.pdfIn PDF document text
    • https://biparobotimipus.weebly.com/uploads/1/3/4/4/134498468/9132385.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455881/normal_6056d60151769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484805/normal_602c618f78c4d.pdfIn PDF document text
    • https://niritopep.weebly.com/uploads/1/3/4/6/134634222/pujagik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/86136219079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b36ff8fd-7991-46fd-ba81-28d2ece77536/compare_and_contrast_analog_and_digital_forecasting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51055e71-241c-40ca-9014-ea7b2e9c6499/soferotopamu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d025616-302a-466c-89d0-4ed7648e11f5/shatter_me_featuring_lzzy_hale_-_lindsey_stirling_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24aee1a7-8efe-431e-a66f-84241180711d/63717253669.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caee03c6-338f-4b79-8425-bf374d78da0e/best_buy_graco_pack_n_play.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/kuwuritigewilamunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/937c6f5e-39db-48bf-bcb3-bc7b74b6a450/santa_cruz_guitar_ukulele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4499e9d4-91ad-46dd-9692-6ab87f67c19c/how_to_write_log_base_2_in_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/excel_vba_cdate_format_dd_mm_yyyy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b356bdbe-ccbc-4051-84d7-268d1d04c086/40048809791.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_off0000dfcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCC 5580 bytes
SHA-256: 8206db7c76df4ea295954e0ff1355122aed2f496ba0de7d885de6591d3193308
font_01_sfnt_off0000f2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DD 11912 bytes
SHA-256: 120d777c131128448ed61da493464c5ed24b6633f73e22d2926f4c61ac641792