Malicious PDF — malware analysis report

Static analysis result for SHA-256 57975e9ffa3c302b…

MALICIOUS

PDF

73.8 KB Created: 2021-02-22 11:15:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9b1a746c95b3d4e55d69c1a38b3d2ed8 SHA-1: df242ece8deedb9cd55d3a736467a8607239a640 SHA-256: 57975e9ffa3c302b5cdb26a00388c596dec6615e9869e7d80f9a5f2c36811099
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body is heavily obfuscated, but the presence of external URIs and the PDF_SEO_LINK_FARM heuristic indicate a malicious intent to redirect users. No scripts were extracted, but the overall structure points to a malicious document designed to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://druttle.ru/wix?keyword=thermochemical+equations+examples PDF link annotation
    • https://cdn.sqhk.co/kitujesijak/agjMhcN/heron_island_wind_forecast.pdfIn PDF document text
    • https://cdn.sqhk.co/rupomotiz/L15hhji/madness_combat_game_download.pdfIn PDF document text
    • https://puwaxitakobesod.weebly.com/uploads/1/3/4/1/134109073/9492480.pdfIn PDF document text
    • https://cdn.sqhk.co/wemerofada/jjhgHhi/katirapibelajojotibotomu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448984/normal_60089b5bac842.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/jbDV5Do/fixab.pdfIn PDF document text
    • https://cdn.sqhk.co/rovifatira/ibhbGhb/traductor_idiomas_por_voz.pdfIn PDF document text
    • https://cdn.sqhk.co/zedawuzijis/fcgLidP/36618329780.pdfIn PDF document text
    • https://cdn.sqhk.co/rigidaluta/bjbiiib/zokuzeravidolojur.pdfIn PDF document text
    • https://bobujiwa.weebly.com/uploads/1/3/1/0/131070874/lefijelujonekodutis.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/ibhc2jb/70842592152.pdfIn PDF document text
    • https://junafoxotoroj.weebly.com/uploads/1/3/0/7/130738975/44910083c4fb50.pdfIn PDF document text
    • https://tugoxalimirufa.weebly.com/uploads/1/3/4/3/134310877/zuguxowe.pdfIn PDF document text
    • https://wimofitadaxota.weebly.com/uploads/1/3/4/3/134362004/d4d4203b.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/suximawo/59693735336.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/jukumusagava.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/h_pylori_treatment_guidelines_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/70190497641.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32D 5316 bytes
SHA-256: 84873a6ade0e6b59f6c1c0e2d17b56f89fc879891eb1c38e52d2ab57cf52ed57
font_01_sfnt_off0000f51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 10812 bytes
SHA-256: 812edcd38ef001f270201a801dd0bf507231a715adaea2332cb6c7f4241389ef

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