Malicious PDF — malware analysis report

Static analysis result for SHA-256 057a0406af9e6837…

MALICIOUS

PDF

73.3 KB Created: 2021-02-27 15:20:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ebcaa185bcc93344969cfff40a99c932 SHA-1: b6beeb6895888d327c1e58cc9f273e22b248d23a SHA-256: 057a0406af9e6837b239498ece7572f61cf1b16c498150069e4526c132986371
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with a high ML classifier score and ClamAV detection indicating malicious intent. The document body, though partially obfuscated, presents a question about water softeners, likely a lure to drive traffic to the linked sites. The presence of multiple disposable hosting domains and UTM parameters suggests a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://xajibur.ru/123?utm_term=why+is+there+no+water+in+my+water+softener+tank PDF link annotation
    • https://cdn.sqhk.co/rakapuvad/cAiePjh/15132308283.pdfIn PDF document text
    • https://cdn.sqhk.co/luwivimexu/diaiaib/mimpi_ular_sawa_kuning.pdfIn PDF document text
    • https://wirosumarot.weebly.com/uploads/1/3/1/3/131398493/2710318.pdfIn PDF document text
    • https://nudabixe.weebly.com/uploads/1/3/4/5/134505388/9959072.pdfIn PDF document text
    • https://numilobes.weebly.com/uploads/1/3/4/2/134235742/kuxelugajuvudifa.pdfIn PDF document text
    • http://www19216801.site/waremuniruzanujidezysu85.pdfIn PDF document text
    • http://nikaold.site/gozarkorc2.pdfIn PDF document text
    • http://gravkamen.ru/mixopene875sg.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/hh8hhAM/55663021862.pdfIn PDF document text
    • http://titoto.xyz/didikevudutekij7gb1p.pdfIn PDF document text
    • https://cdn.sqhk.co/temetixufuxi/gjv39hh/bucher_magazin_gewinnspiel_02_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/najafizox/ihhbhhj/primo_pizza_food_truck.pdfIn PDF document text
    • https://cdn.sqhk.co/pijajawopoji/ckBVxW3/tier_2_battle_gods_simulator_codes.pdfIn PDF document text
    • http://micrometer25bill.site/age_of_rebellion_full_castn9pdd.pdfIn PDF document text
    • https://kaginugopaz.weebly.com/uploads/1/3/4/3/134310825/kivaluteru_giwuxesujumiler_gilaxekok_zuzunujemef.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/jJRTaia/auto_change_wallpaper_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE143 5244 bytes
SHA-256: 05ec6ef35414f781ced464e02201cdb70c577ff97ffe7385948228c9db7211ff
font_01_sfnt_off0000f30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 11252 bytes
SHA-256: 851913d4a77670a5a1e642360a4539c21d101ff98de8f0b377b97fcd4b86f110

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