Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c481bf661ae480…

MALICIOUS

PDF

78.0 KB Created: 2021-03-28 16:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a11894d6b4d99088ad1ea35c2215b7ec SHA-1: 8b145c4ddfd91ecda19f9640f4ac97b3109ddb16 SHA-256: a0c481bf661ae4805560cef4daa4ef0f42bd5eb87d6003542ceada110732cfe2
156 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 0.9998

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 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://dugedepap.ru/strik?utm_term=power+electronics+engineer+job+description PDF link annotation
    • https://zalamozosuk.weebly.com/uploads/1/3/6/0/136089451/2016355.pdfIn PDF document text
    • https://masizomomom.weebly.com/uploads/1/3/2/6/132681315/6692001536a.pdfIn PDF document text
    • https://tinofapilasi.weebly.com/uploads/1/3/4/5/134518201/d2605dd7435.pdfIn PDF document text
    • https://miwebuzoz.weebly.com/uploads/1/3/4/0/134095964/bedepisejod.pdfIn PDF document text
    • http://delayikapy.xyz/do_mayor_acorde_pianoryp42.pdfIn PDF document text
    • https://xomikevogonenoj.weebly.com/uploads/1/3/4/7/134743799/nupijat.pdfIn PDF document text
    • https://rixogeki.weebly.com/uploads/1/3/4/6/134693266/3569672.pdfIn PDF document text
    • https://ponadolofulofuk.weebly.com/uploads/1/3/1/3/131398561/9267296.pdfIn PDF document text
    • http://kukushpa.fun/what_is_the_move_objects_cheat_sims_334js5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jatokipukaku.epizy.com/tadujitufora.pdfIn PDF document text
    • http://fevoreselo.epizy.com/lekibuto.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/kexuzuxo.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/america_s_got_talent_las_vegas_performers.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/introduction_to_pharmacy_calculations.pdfIn PDF document text
    • http://zurimuvuk.epizy.com/introductory_geographic_information_systems_jensen.pdfIn PDF document text
    • http://wepinipinalojud.epizy.com/canon_photo_editor_for_mac_free.pdfIn PDF document text
    • http://rirazito.epizy.com/autumn_tale_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/how_to_get_hp_printer_to_print_alignment_page.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE563 5128 bytes
SHA-256: 416abf9602a8762c8c100503de63f2bb6d2cbccc87eb16eb3818a9b05d5fe14c
font_01_sfnt_off0000f6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E8 11060 bytes
SHA-256: 1ea86bad0573eb1e160f0523b5d4d0f7c3b383f7dbc1f48fc7f3b5825ab92d8b
font_02_sfnt_off00011cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC2 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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