Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b541ef1834aef7…

MALICIOUS

PDF

76.3 KB Created: 2021-02-15 00:00:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d30fc8020be7445134f700a0956767bf SHA-1: 78ed1696ea9a2db5705f83cbb576798d495c5d00 SHA-256: 53b541ef1834aef78d3f53f234afe9311a5c95ba63835c6988deb8305ec86931
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly-hosted PDFs, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious content or exploit vulnerabilities through the linked PDFs. No scripts were extracted, and the document body was heavily obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://jacksth.ru/wb?keyword=iseek%20answerworks%20english PDF link annotation
    • https://labifunuvi.weebly.com/uploads/1/3/4/8/134847398/49ed3da2dff.pdfIn PDF document text
    • https://rikulaseno.weebly.com/uploads/1/3/4/4/134471776/3488460.pdfIn PDF document text
    • https://cdn.sqhk.co/mupijuwo/yihgdN1/rush_hour_bus_minneapolis.pdfIn PDF document text
    • https://najovukuno.weebly.com/uploads/1/3/1/4/131453374/sejasunudoxoremaf.pdfIn PDF document text
    • https://fogasofimoxor.weebly.com/uploads/1/3/1/0/131071298/a5263b36a8746.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/gehiVE4/zonurumovawajelob.pdfIn PDF document text
    • https://fibarivinudew.weebly.com/uploads/1/3/5/3/135387866/ec151.pdfIn PDF document text
    • http://graatorama.space/hegen_teat_guidesx0du.pdfIn PDF document text
    • https://fozirufimagez.weebly.com/uploads/1/3/0/9/130969558/c4c93e53.pdfIn PDF document text
    • https://dawasaga.weebly.com/uploads/1/3/0/9/130969366/vabixirigawuza.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/J9T0ijI/nasa_asteroid_approaching_earth.pdfIn PDF document text
    • https://budamasut.weebly.com/uploads/1/3/4/9/134903336/3989092.pdfIn PDF document text
    • http://bottlechainworld.com/canape_abatible_yecoly0m4p.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/hcDihWo/war_intro_bgm_ringtone_download.pdfIn PDF document text
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/balawuveruxod_narolumux.pdfIn PDF document text
    • https://lututigit.weebly.com/uploads/1/3/5/3/135335707/luxejiv_kofobilox_roboxab.pdfIn PDF document text
    • http://devgm.design/44753324908jrier.pdfIn PDF document text
    • https://cdn.sqhk.co/fopujetoros/WXJaL8k/94931423809.pdfIn PDF document text
    • http://support-copyrighthelpservice-about.com/asturias_guitarra_clasica8mlxm.pdfIn PDF document text
    • https://lanapovo.weebly.com/uploads/1/3/1/4/131437145/betol.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
    • 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_off0000e065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE065 4748 bytes
SHA-256: 6aec1df4a8528d4822c9b4aac29c24b29a6fa87d44d72dcd3deecb83dfa9853f
font_01_sfnt_off0000f078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF078 11040 bytes
SHA-256: 55fddbca6c356fd7b184b714e26488adeb9e088bc54556c16539f30b12e8425d
font_02_sfnt_off00011621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11621 4324 bytes
SHA-256: 781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60

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