Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0000b4bd9fdd57f…

MALICIOUS

PDF

73.4 KB Created: 2021-03-08 09:23:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8da1166c285659d071b55c16acd90a32 SHA-1: 142a0c2ed948c5a86707b9fc86f9fded9e2d06ad SHA-256: d0000b4bd9fdd57fe4754500678345375c6994873a615d51fc231f6764c75181
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be related to 'factoring day 2 worksheet answers', a common pretext for phishing or malware distribution. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/wix?keyword=factoring+day+2+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/lukejisuvawe/3FqAcib/tunnel_town_wikipedia.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/ru2NChg/company_of_heroes_2_wikinger_realism_mod.pdfIn PDF document text
    • http://toportt.online/call_of_duty_cold_war_beta_gameplaykbqkn.pdfIn PDF document text
    • http://sexedate69.site/valojokojebikarunokivx3fq0.pdfIn PDF document text
    • http://studytogether.fun/the_walmart_effect_by_charles_fishman47yff.pdfIn PDF document text
    • http://dorightschool.com/piliwarae80w6.pdfIn PDF document text
    • https://cdn.sqhk.co/tozerutiwezu/4ljOChj/35873045685.pdfIn PDF document text
    • http://anyita.space/dan_the_manapua_mani4ur8.pdfIn PDF document text
    • http://snapchat-alert.com/dokuzidikixavisenubow4zwbs.pdfIn PDF document text
    • http://okclub.org/bella_s_lullaby_piano_sheet_music_original3487d.pdfIn PDF document text
    • http://afracheat8.xyz/6736112773a6l3s.pdfIn PDF document text
    • http://ketosimple.online/pokemon_masters_guide_gamepressawhgi.pdfIn PDF document text
    • http://alisabor.design/bipap_a40_brochure93krb.pdfIn PDF document text
    • http://avlto.best/65743796061qmis7.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/bisegilupuf/koxinipokusij.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/1607762641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5d14a3b-371a-469b-b983-0fa8af82f42c/fidabatofilemagitutujutas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d895e63f-b24b-4f18-af8a-6ca112d2002e/93270118730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7302461f-76c2-4da9-8ce5-7fb368f5d646/zaduxixigus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6fc712a-942e-4776-bdc0-43f12d4c0d49/64081049163.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE087 5512 bytes
SHA-256: 62d228cbe74573434ce46454583c670c98288c386cd1088d50e5210459bfd18b
font_01_sfnt_off0000f358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF358 10864 bytes
SHA-256: 5724b57bde580ccf4c2ef3f88e4cd98f592918eef8d535bd4eeba4df63041c11

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