Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7430e0c4a01b399…

MALICIOUS

PDF

79.0 KB Created: 2021-04-01 12:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 637bb3e85b3e07e4010cddac0450fe94 SHA-1: d0846af3e760f0e7cf83dd2ad667278b7aa7d319 SHA-256: e7430e0c4a01b3998787be39356065bd772fdb309ceb6219c12e5ced3c134832
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, with a critical heuristic identifying it as a PDF link farm. The primary external URI points to 'https://dafemum.ru/123?utm_term=incontinence+bed+sheets+disposable', suggesting a lure related to incontinence products to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/123?utm_term=incontinence+bed+sheets+disposable
    • http://babblescoop.store/stephensons_of_essex_bus_timetables4937b.pdf
    • http://cesaregaspari.com/sanidry_sedona_dehumidifier_pricelk53o.pdf
    • http://erkutungotu.com/onkyo_tx-nr838_7.2a4k9s.pdf
    • https://cdn-cms.f-static.net/uploads/4476273/normal_600a4eb94f8cf.pdf
    • http://levantemosaic.com/zuveterafogowasugegowepikxlpc8.pdf
    • https://cdn-cms.f-static.net/uploads/4416654/normal_605d1f4d93f91.pdf
    • http://sanelobazigi.medianewsonline.com/asientos_contables_ejemplos_resueltos_peru.pdf
    • http://bizowokare.getenjoyment.net/37597798175.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e38480c4-d2bf-4d1c-96a6-210f5cbd2811/55662163611.pdf
    • http://niwurekatexo.atwebpages.com/6th_grade_history_test.pdf
    • https://uploads.strikinglycdn.com/files/1c1ee216-60c6-4e8d-a44b-98cb015a41b0/how_to_draw_a_circular_flow_diagram_in_word.pdf
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_8a57cf8a15db485aa6d7a118c8864983.pdf?index=true
    • https://uploads.strikinglycdn.com/files/58b2839e-4669-4697-aa6a-0ce68012384a/what_is_gift_of_discernment.pdf
    • https://uploads.strikinglycdn.com/files/0e84a061-54c7-4721-a132-94245d25ef9d/29028199796.pdf
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_825d25fa38e1471b83e5678d06c0affa.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9eef48e7-aa41-451d-87ca-ae488211dfd6/sportline_pedometer_342_instructions.pdf
    • https://uploads.strikinglycdn.com/files/bedad013-7d41-4bff-a250-0bdf94c2196b/topafirukibataxopabuna.pdf
    • https://uploads.strikinglycdn.com/files/9b1520fa-0822-4dec-a114-76e61ebda5e1/does_punctuation_go_inside_inverted_commas.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f554.bin
eaf7a2a08dea9081397d0929a48796f7bc9eb1f589204158e072964f9772080d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF554 5144 bytes
font_01_sfnt_off000106cb.bin
4e1d598fe95c6f4284d82b3e3f21fce105f8fc49b0988d6bc358290e765fda74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106CB 11376 bytes

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