Malicious PDF — malware analysis report

Static analysis result for SHA-256 54672437c808188c…

MALICIOUS

PDF

75.4 KB Created: 2021-04-15 23:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d572f52b8b9beb9c2b189246411a19d0 SHA-1: c65cb5e0fae809988e9c30385b5ef65b5bbe2f1d SHA-256: 54672437c808188cacfc0a11fca8381f2d2cfd33f1dd1b653a88d007c82d71e9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://midufefew.ru/strik?utm_term=life+skills+training+curriculum PDF link annotation
    • http://healthyforczechrepublic.site/craftsman_evolv_3_gallon_air_compressor_manualzcbpp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453551/normal_5fef53e3d4c84.pdfIn PDF document text
    • http://marinarus.space/jabogapakuzagawafolen19nps.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/hKNhfYq/antivirus_scan_app_free.pdfIn PDF document text
    • http://universityru.fun/zufelenilazazobepq96q.pdfIn PDF document text
    • https://cdn.sqhk.co/gasidonoda/uwjjLgg/zuvakukafofekunivupuga.pdfIn PDF document text
    • http://mivukiwoluwuj.iblogger.org/jadosezateramak.pdfIn PDF document text
    • https://pibiwija.weebly.com/uploads/1/3/4/8/134896476/239643.pdfIn PDF document text
    • https://livesagu.weebly.com/uploads/1/3/1/4/131437401/paxipujoxu.pdfIn PDF document text
    • http://frasqen.online/kjv_1611_bible_with_apocryphazahs7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367914/normal_5ffb0efd6dd9f.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://puzexexaniledow.epizy.com/twinkle_little_star_piano_sheet.pdfIn PDF document text
    • http://wujasulo.epizy.com/47493797857.pdfIn PDF document text
    • http://xaxodizanuro.epizy.com/attention_span_of_students.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC4 4976 bytes
SHA-256: a60e2b6b761752afc0e40d9a9e912211d31faf6a66e8643a83e77fd2bec2d28c
font_01_sfnt_off0000ed97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED97 10904 bytes
SHA-256: 829111e3166f1184f0af2d5d52064e3aad09327da24f4be86584c57bad38ff50
font_02_sfnt_off000112c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C9 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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