Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ad54c6415818b9…

MALICIOUS

PDF

75.8 KB Created: 2021-02-23 11:22:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a7bff13dca3c44748cd4d39ca760f936 SHA-1: 7a54bdc168ec1144222a01732b31b089ee683b15 SHA-256: 83ad54c6415818b98e3ab13dd9f904b5c517fe6703b28542868b97a7a4056b7a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The primary URL, 'https://maypoin.ru/123?utm_term=where+to+learn+cosmetic+tattooing', suggests a lure related to cosmetic tattooing. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely to redirect users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://maypoin.ru/123?utm_term=where+to+learn+cosmetic+tattooing PDF link annotation
    • http://antonioit.fun/how_to_describe_stress_in_writingfaai9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383924/normal_5fc5c9b304ca6.pdfIn PDF document text
    • http://adv-workshop.site/50835062012o50so.pdfIn PDF document text
    • https://netebina.weebly.com/uploads/1/3/4/5/134596662/788b89e33a7.pdfIn PDF document text
    • https://werumitepoli.weebly.com/uploads/1/3/0/7/130739038/sezuxoxetovodilitid.pdfIn PDF document text
    • http://endi-itali.space/jimojurios5ba.pdfIn PDF document text
    • https://bowutemol.weebly.com/uploads/1/3/4/2/134234741/08cc81c.pdfIn PDF document text
    • http://item-mask.top/73201295858k6k73.pdfIn PDF document text
    • http://boldly-grow.com/rhythm_city_18_september_2020_full_episode51yu2.pdfIn PDF document text
    • http://contact-git.top/telugu_academy_b._ed_psychology_books32i08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366665/normal_5ff912dce5b75.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/sajatesawodiji/jeporabewekulenoxij.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/69834588123.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/15768300911.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_off0000e151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE151 2940 bytes
SHA-256: 5205dc029b2d4b0ae44ddd8c96d056e1801b9f6b3c115db4e44038fa36e83b83
font_01_sfnt_off0000ebdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDD 5228 bytes
SHA-256: d2629b2ddc09be68de8859ef814b71ad91972881ea059e79361e68723e529fcf
font_02_sfnt_off0000fd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD82 10460 bytes
SHA-256: 323b71462845f59dc34d89837d619795b9d5b686dab9b28b5f63c8297f1f49fa

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