Malicious PDF — malware analysis report

Static analysis result for SHA-256 164aa60ec1019e98…

MALICIOUS

PDF

81.9 KB Created: 2021-04-18 01:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3d24888cbd80e8cdb0b989d969e18e98 SHA-1: d0e45e29e425ac5fa24b7e7a4ef39333b8268a3b SHA-256: 164aa60ec1019e9842d1ce09727cf6350772d9992c518da15dd7ea13c0a6af9a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, including suspicious ones hosted on disposable domains and link farms, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and link farm heuristics points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/strik?utm_term=proform+hybrid+trainer+workout+apps PDF link annotation
    • http://jizerigozigalav.getenjoyment.net/zadero.pdfIn PDF document text
    • http://faxagamebajara.mypressonline.com/fejikisujujig.pdfIn PDF document text
    • https://cdn.sqhk.co/lizasizova/gerjjia/63869916584.pdfIn PDF document text
    • https://cdn.sqhk.co/wepugozotap/bjdhffd/team_pulse_check_survey.pdfIn PDF document text
    • https://cdn.sqhk.co/talokelom/Njhgd5v/bang_bang_bang_just_dance_artist.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/Yhbhcih/6781701798.pdfIn PDF document text
    • https://tunuzari.weebly.com/uploads/1/3/4/3/134316111/bowatilora.pdfIn PDF document text
    • https://cdn.sqhk.co/pojukitogex/iigijGO/pevijaluwezupojebikalego.pdfIn PDF document text
    • http://zelumefepa.sportsontheweb.net/hindu_calendar_2020_in.pdfIn PDF document text
    • https://xafukulirodut.weebly.com/uploads/1/3/1/3/131379356/9920532.pdfIn PDF document text
    • http://niluwipewuxasa.medianewsonline.com/resumen_corto_de_la_obra_los_crimenes_de_la_calle_morgue.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://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_3d9c8a1e315648a4a61429acd6ff32c8.pdf?index=trueIn PDF document text
    • http://zogoxuf.atwebpages.com/archaeology_books_in_sinhala.pdfIn PDF document text
    • https://s3.amazonaws.com/kafises/sub_zero_fridge_repair_vancouver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b132b73f-7d96-4b89-99b6-9c26821bef09/uk_army_enlisted_rank_insignia.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/bazoloki.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/how_to_program_genie_intellig_1000_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/denezi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f782858b-fbc0-48a8-9625-4de5dd003ddb/public_speaking_definition.pdfIn PDF document text
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_ee2569649512483e9dcde334726839a0.pdf?index=trueIn PDF document text
    • https://6e6ad6c0-90f2-4367-a025-4e24aeda1d0e.filesusr.com/ugd/c9b7fc_33befae4446043e1948259c59037673d.pdf?index=trueIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_d7f92af30698450886f83e57d57598c9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/94568ec9-52cd-4258-a07d-972e9c80b5e2/sevugesu.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_off0000f380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 5528 bytes
SHA-256: 81a3103d04b09a468690e8ab2d01dd89194649cb3b63a5de95527638629c9c75
font_01_sfnt_off0001062f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062F 10580 bytes
SHA-256: 5d27b06a24750b4fbff76294099f8513d9f499977b1e89944401747e34afb8c5
font_02_sfnt_off00012a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7A 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f