Malicious PDF — malware analysis report

Static analysis result for SHA-256 3178405d43be0249…

MALICIOUS

PDF

80.2 KB Created: 2021-04-20 09:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 50b956651f7693dedea2de381fd87dcc SHA-1: 2a0dd9b57897900427bc921d011fc1bb91e64c48 SHA-256: 3178405d43be0249249bcb8adb6c687ee88b91a9c65969cf285c709b684d6065
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score. It contains numerous external links, with one pointing to 'https://zajinet.ru/strik', suggesting a phishing or malicious redirection attempt. While no scripts were explicitly extracted, the PDF structure and link farm indicate a malicious intent to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zajinet.ru/strik?utm_term=briggs+and+stratton+22+hp+engine+oil+change PDF link annotation
    • https://xojozojejaxito.weebly.com/uploads/1/3/4/8/134866115/pogekanener_xefol_vapim.pdfIn PDF document text
    • http://wozuxel.getenjoyment.net/cuento_blancanieves_disney.pdfIn PDF document text
    • http://fejavodexata.getenjoyment.net/sujepokogigeloxijumali.pdfIn PDF document text
    • https://tipureroxagojox.weebly.com/uploads/1/3/6/0/136096040/2828667.pdfIn PDF document text
    • http://viteroludobano.mypressonline.com/xikimatarukipejirozizuv.pdfIn PDF document text
    • http://pafowitowa.medianewsonline.com/the_48_laws_of_power_mastery_by_robert_greene.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
    • https://s3.amazonaws.com/zufojadibi/uc_browser_smart_tv_apk.pdfIn PDF document text
    • https://b860438a-ced3-4995-86f2-ad9a24e3f15c.filesusr.com/ugd/938eb2_83b8117d3a8b4836a08549fbd7c4641b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/95170077217.pdfIn PDF document text
    • https://00f02ae0-031c-4cf4-85c3-86bbc6d7deb2.filesusr.com/ugd/13f2e4_5d49c07a7966475983854353022c3eee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farokof/93157886963.pdfIn PDF document text
    • http://fazaburifug.myartsonline.com/gapexoxolibi.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/pazugabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d15cf484-b8bd-495f-a1e5-3ee3b4241929/focusrite_scarlett_2i2_tech_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4850022-5bfe-4a15-916e-db7c1cc56b8b/samsung_hw-hm45c_check_subwoofer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a53aab91-85f6-4cb6-9a38-e78d3270696b/vitamix_5000_spare_parts.pdfIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_2f413033d04f45bcb9c21773a98170e0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazomo/excel_vba_copy_range_of_cells_into_array.pdfIn PDF document text
    • http://xobebol.onlinewebshop.net/35757245808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86464744-95fa-4255-8c14-284f4a666df1/5407186006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22a281a7-1764-40fc-804e-5d81e0f5a25e/how_to_use_casio_rangeman.pdfIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_979dace9c2db4c36bd343db69359f2c7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xixonu/atp_2020_calendar.pdfIn PDF document text
    • http://sulorowanutabu.atwebpages.com/after_we_collided_part_2_release_date.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_off0000ef86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF86 5304 bytes
SHA-256: 9fb629b0a6936531a5eb60815313affe1e91b30c355c7bfb5e29ce6100bf4964
font_01_sfnt_off00010185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 10264 bytes
SHA-256: a3f6585a8adca004cd17ebc80d051eb0d8f8084c7b6ae8ee6bc08f869862e4e6
font_02_sfnt_off000124bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BD 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3