Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b359773bdfd32e5…

MALICIOUS

PDF

72.1 KB Created: 2021-02-22 11:27:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b47bf4d30123d268b44e4e950049bcc1 SHA-1: ebb03e0c6a1fee6d02ab840a5d6f356c95de2239 SHA-256: 0b359773bdfd32e538be8ee07158f81466b28e1558557bce02edad2dda3e6cd9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://jottigo.ru/wix?keyword=download+badoo+apk+new+version PDF link annotation
    • http://beliyden.xyz/49141496776r4iy7.pdfIn PDF document text
    • http://zumbayuliya.online/mepaziwozonagebasupebajdiz1h.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/H3Vhbhg/air_attack_2_mod_apk_unlimited_money.pdfIn PDF document text
    • https://rilulozopofebu.weebly.com/uploads/1/3/1/4/131406258/6b6a5d.pdfIn PDF document text
    • https://mafexanilexa.weebly.com/uploads/1/3/0/7/130739060/delaxumigexuvil-tufafasapu.pdfIn PDF document text
    • https://piwirajaluz.weebly.com/uploads/1/3/5/3/135312697/genaxekurovawi-lugivejinixa-jimupaz.pdfIn PDF document text
    • http://copriyghtconfirmed.com/2903911406wirju.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/i11Ojcu/groupme_app_for_macbook_pro.pdfIn PDF document text
    • https://cdn.sqhk.co/tizalenifo/higihjb/tetris_effect_pc_vr_mode.pdfIn PDF document text
    • http://canlisohbetim.net/seralezibezasinofakaohi39.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/fbda3f3a572.pdfIn PDF document text
    • https://cdn.sqhk.co/fomezawelud/iiHyjiT/10233640265.pdfIn PDF document text
    • http://checkmycredit.info/515490342xuoh5.pdfIn PDF document text
    • https://xesinuvukuwufo.weebly.com/uploads/1/3/0/7/130776104/bonejo-siwat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/30352067458.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/sixth_sense_technology_ppt_slideshare.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/experiencing_god_workbook_free.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4A 5308 bytes
SHA-256: 76564f5701c2da39d9a8f4b5ac7badb0d84f5a363a3df7c52a87f05f1cde31db
font_01_sfnt_off0000ef7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7E 10440 bytes
SHA-256: e45707a651cf626fb9c4f123983865262df31cb9b9127757b270f843a3ab3f47

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