Malicious PDF — malware analysis report

Static analysis result for SHA-256 11bfe74afc3ee01b…

MALICIOUS

PDF

69.6 KB Created: 2021-05-15 02:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 105c1a31a022bfb5e76fb6d3ebddb50e SHA-1: 2e81ed88d453dbd9e777a5dcb56c07d8a3480f63 SHA-256: 11bfe74afc3ee01ba30c23afa9dcfdd8e21c6e2a1bfe4c18a1380bc3a482ce6a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO spam operation. The primary URL is disguised as a 'Cub cadet 2166 drive belt replacement' guide, a common lure for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate malicious intent, likely to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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/strik?utm_term=cub+cadet+2166+drive+belt+replacement PDF link annotation
    • https://ganalazukomej.weebly.com/uploads/1/3/4/7/134714395/gisine-gowukomose-nizatego.pdfIn PDF document text
    • https://norulekilaj.weebly.com/uploads/1/3/4/7/134712763/jisonozebolakopupeg.pdfIn PDF document text
    • https://fogasofimoxor.weebly.com/uploads/1/3/1/0/131071298/lixopixonimud-guginowonorifep-zugepuvogep-jolam.pdfIn PDF document text
    • https://vesanalu.weebly.com/uploads/1/3/1/4/131482823/dcc826c6.pdfIn PDF document text
    • https://galezarulunozip.weebly.com/uploads/1/3/4/8/134896955/vubademikibo.pdfIn PDF document text
    • https://pikoxujedogusu.weebly.com/uploads/1/3/4/6/134665618/6263280.pdfIn PDF document text
    • https://sugogovofel.weebly.com/uploads/1/3/1/0/131069978/c98f4b01b34e7.pdfIn PDF document text
    • https://cdn.sqhk.co/talulofofexa/gcKjeR0/prize_claw_2_mod_apk_revdl.pdfIn PDF document text
    • https://bivesazi.weebly.com/uploads/1/3/4/6/134652180/tupidupuvatevox_rolune_nosemajuwixu_juwuxejaw.pdfIn PDF document text
    • https://cdn.sqhk.co/jefutubup/eA6XwxA/wuroxejexovizoji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7a62cf4-d5e4-4f03-a5d3-b63f16210e7e/26639811280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09e46215-c1cc-4ee2-978a-b66dc57067ac/optiplex_780_drivers.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/decimal_division_worksheet_generator.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/26969249566.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/cirque_du_freak_movie_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/xodenaxukopubigozu.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/50181547559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb6c8a02-8af7-4a4a-847d-3f667d0c66c0/nagoguwofare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a86c0c3a-fb0f-4a69-8507-4129de1f1a95/dyson_dc35_digital_slim_multi_floor_cordless_vacuum_cleaner.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/48854908072.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/ssc_admit_card_2017_bangladesh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe57a669-e0a8-497b-af15-0db7e3755bf0/ice_cream_machine_low_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/87164934565.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_off0000cf48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF48 5484 bytes
SHA-256: 0480619a267833a88365e2708611b61fed8e7a99b04b5410a804c8be3ced00f9
font_01_sfnt_off0000e1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DD 10900 bytes
SHA-256: 9db1e2e192c33eb329e2896aa6913e5cd10a9e3e670aab60520992b52454e2b3

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