Malicious PDF — malware analysis report

Static analysis result for SHA-256 7138efae8e88d860…

MALICIOUS

PDF

71.7 KB Created: 2021-04-09 09:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: da3394b9ba2b39e91598c4ba6f5b7ac5 SHA-1: c48182553c43c03a26089a80df91d3e3f231f91e SHA-256: 7138efae8e88d860d3c635bd72865d83bb430c637cc1aa416a8a2c742454e39f
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'Oracle 11g sql developer.bat not found', likely intended to trick users into downloading a malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=oracle+11g+sql+developer.bat+not+found PDF link annotation
    • http://astropsychology.website/77955174221n7i74.pdfIn PDF document text
    • http://passive-income.ru/gonisibapexifnmp7.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/CtgeAkE/xujugu.pdfIn PDF document text
    • http://how2clever.com/magegelokazevalusigixidbn85i.pdfIn PDF document text
    • http://servicesforsupport.com/fewazejegajipia58vw.pdfIn PDF document text
    • http://rezonansmusic.com/hp_photosmart_7520_e-all-in-one_printer_cartridgesn6lox.pdfIn PDF document text
    • http://wowit.pro/ninimikowaze7z5ra.pdfIn PDF document text
    • https://cdn.sqhk.co/kufagilan/qhfJiaE/46347870060.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CtjdgtM/fast_money_halftime_report_cnbc_fix.pdfIn PDF document text
    • https://cdn.sqhk.co/wexunaveb/sjgdhg2/3097262411.pdfIn PDF document text
    • http://prizinsta365.online/asus_ac68u_vpn_client_setuplzhzd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_3b471524fba6471b829439e0b65afa4e.pdf?index=trueIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_b3a6557f413b402e9c38d40174ceb253.pdf?index=trueIn PDF document text
    • http://diwufebojufazet.epizy.com/pluralisme_hukum_indonesia.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/68671811421.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/72914262677.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/eau_guidelines_asymptomatic_bacteriuria.pdfIn PDF document text
    • http://zepurudevivo.rf.gd/es_file_explorer_android_tv_apk.pdfIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_5b9f377d8cd94a3cae2dc63b2664b386.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/dream_interpretation_dead_snakes_everywhere.pdfIn PDF document text
    • http://zerojalosa.rf.gd/nicomachean_ethics_w_d_ross.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/spotify_apk_premium_apkpure.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_off0000d62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62C 5760 bytes
SHA-256: cfeb9ea50b47eb15dfcdd809df130d8ef298141af225ce1cd777388527dddbb2
font_01_sfnt_off0000e9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D9 11672 bytes
SHA-256: a782748c985e87d2ef220942cf147699b4cafd8a5467cd24f6c04106ed57e16c

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