Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a9dc602a35033a3…

MALICIOUS

PDF

83.6 KB Created: 2021-03-28 19:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0700c863719584fb58f85aa7fb0111b9 SHA-1: 9ea1bc6c9875694da65748f1ea6919d49b9da379 SHA-256: 6a9dc602a35033a39b463c847394737b979e4c5cd8c0084f8858d503e28515a7
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm for SEO or malicious redirection. The ClamAV detection and ML classifier strongly indicate malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be part of a multi-stage attack where a password is provided to decrypt a payload, though no scripts were directly extracted to confirm this.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://lozipotod.ru/123?utm_term=album+song+tamil+ringtone++2018
    • http://dadevizevarek.scienceontheweb.net/altruistic_emotion_cognition_and_behavior.pdf
    • https://butusokusumowa.weebly.com/uploads/1/3/5/2/135294155/8765548.pdf
    • https://bujabofilurukok.weebly.com/uploads/1/3/2/6/132682168/sisufetixisap.pdf
    • https://fesifikigit.weebly.com/uploads/1/3/5/3/135319823/peratalami_zulotekubefo.pdf
    • http://kirakexig.mypressonline.com/14653258313.pdf
    • https://selijexobava.weebly.com/uploads/1/3/1/8/131856120/gavoxisuraki.pdf
    • http://pubopogebam.22web.org/99_names_of_allah_colouring_sheets.pdf
    • https://mufosuxid.weebly.com/uploads/1/3/4/0/134040625/4613440.pdf
    • http://toworugesolur.getenjoyment.net/how_many_books_are_in_the_cirque_du_freak_series.pdf
    • http://kigetipopizatij.getenjoyment.net/54848791622.pdf
    • https://moramiwise.weebly.com/uploads/1/3/4/7/134736235/1152789.pdf
    • http://zomaragexavope.sportsontheweb.net/apa_citation_manual.pdf
    • https://wewodagib.weebly.com/uploads/1/3/4/2/134266566/35148ae.pdf
    • http://bamiluzigu.mygamesonline.org/cell_cycle_and_mitosis_packet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pamerugug.epizy.com/87402003153.pdf
    • http://famekuputoda.myartsonline.com/gomanuruvogu.pdf
    • https://uploads.strikinglycdn.com/files/d94fac33-2473-408e-a8c3-b23852bdc7fb/pojamanidemirewizivobixab.pdf
    • http://doliwoxebokuk.rf.gd/teori_neo_marxisme.pdf
    • https://uploads.strikinglycdn.com/files/11d15e52-db9e-4219-aff3-9acb2ade3b17/black_and_decker_food_processor_replacement_parts_fp2500.pdf
    • http://wepaxilex.epizy.com/why_is_my_service_brake_system_light_on.pdf
    • http://leparitupoxow.onlinewebshop.net/50451959793.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_off000106f0.bin
05418ec637114437d9e2f033d148fab0bd55840924fd729ba0c62f2760732eb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106F0 5652 bytes
font_01_sfnt_off00011a0c.bin
58da1e2c015d146a1ebf652f85d30c9750e1186bc9a97efa30669e2ea79fd7f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0C 11556 bytes

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