Malicious PDF — malware analysis report

Static analysis result for SHA-256 861ebf5259285481…

MALICIOUS

PDF

82.0 KB Created: 2021-03-18 01:57:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f38fb11b150a04aef79be5d9e68b02a0 SHA-1: 685a5daa2e555894b2a588252ebbc667406f59c0 SHA-256: 861ebf525928548155c119cfa0d591048068f33541151f5e0564d2b04692e6de
156 Risk Score

Malware Insights

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

The PDF file contains a lure related to 'Attack on Titan' and directs users to a suspicious URL, golowaki.ru. This URL is likely part of a phishing or malware distribution scheme. The PDF also contains a large number of external links, suggesting a link farm or SEO manipulation tactic to drive traffic to malicious sites. ClamAV and ML classifiers also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/aws?utm_term=attack+on+titan+season+3+opening+2+download+mp3
    • http://rotokapaz.22web.org/82533465427.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fff87609-b4ac-469c-afe8-5557cdb80b53/tukofoxu.pdf
    • https://s3.amazonaws.com/nuxepiduded/vapebizesovetesoxozemanem.pdf
    • https://s3.amazonaws.com/xisakazelelinim/38234701115.pdf
    • https://2cc12256-1025-444a-bacb-901a9f007bda.filesusr.com/ugd/d1fcfc_dbe951059a5346b8b2123892d7aecc2e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/527c3a4d-e1ab-4e40-8a43-b7fe404f66eb/how_to_fix_kenmore_ice_maker.pdf
    • https://s3.amazonaws.com/ziwuvijevo/9438745247.pdf
    • https://s3.amazonaws.com/xixonu/jisegapib.pdf
    • https://s3.amazonaws.com/dejolavubukugeb/company_of_heroes_2_spearhead_mod_guide.pdf
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_6df6c282ca44447995df35015d0865b5.pdf?index=true
    • https://s3.amazonaws.com/muvazi/final_fantasy_xii_zodiac_age_rare_game_guide.pdf
    • https://s3.amazonaws.com/dosipive/makusidajibikowam.pdf
    • https://s3.amazonaws.com/lixasifasi/benenupituni.pdf
    • http://wadekazu.epizy.com/lunuxojudosisomali.pdf
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_3a9b226c4c51492fb8ec11269f7e8f0b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/118bf916-16d5-468a-9736-a33206a80fe3/4_seasons_activities_for_preschoolers.pdf
    • https://s3.amazonaws.com/tobojelusiwi/78265258826.pdf
    • https://s3.amazonaws.com/samopakamefap/brindisireport_cronaca_oggi_carovigno.pdf
    • https://s3.amazonaws.com/jadudusujuje/39654333613.pdf
    • https://s3.amazonaws.com/viromibukoleliw/bumblebee_soundtrack_mega.pdf
    • https://a72a44ae-2aae-4d6a-a6c4-235301d0a62e.filesusr.com/ugd/57436b_cca01fd3599c4f11925e151a566267c5.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e101.bin
dd14ccc7839243cd380dd1b8c982e4ba206e8071cdc39ff5d9c546428d1c2088		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE101 6176 bytes
font_01_sfnt_off0000f68d.bin
aff9fa455ea460250d0375afe42643dcd10fd9b729c60a432777ad60c66b3911		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF68D 5740 bytes
font_02_sfnt_off00010a25.bin
923425806c654c4454fd720a0940a0b916ef0230e42ac48aca7847e560ac05db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A25 18040 bytes

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