Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7416f8fb1cc9ac…

MALICIOUS

PDF

73.1 KB Created: 2021-02-23 12:25:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 17787a33b2592a4ed812f9ee5bfbf463 SHA-1: b70faff7e8081758349a6db4a1d79fce293e5ab0 SHA-256: 5a7416f8fb1cc9acf00c0ee4909d39ce693844fb693d6b2b996a88aefb4f2ab0
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to suspicious domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm heuristics further supports this, indicating the document's primary function is to redirect users to potentially harmful 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://leonvi.ru/123?utm_term=rival+20+quart+roaster+oven+replacement+pan PDF link annotation
    • https://cdn.sqhk.co/ramekodetuwe/pgjgjgc/tiny_village_new_game.pdfIn PDF document text
    • http://klossheff.xyz/can_trx_get_you_rippedic0ag.pdfIn PDF document text
    • http://serikanipesemo.iblogger.org/44701545041.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiren/6ieLlhi/xunuked.pdfIn PDF document text
    • https://cdn.sqhk.co/kerikone/Azahehb/36793610093.pdfIn PDF document text
    • http://haifaiv.ru/lucifer_malayalam_movie_bible_quotesarb5c.pdfIn PDF document text
    • http://tiwigibafofovit.iblogger.org/majil.pdfIn PDF document text
    • https://cdn.sqhk.co/nozelenid/Wijgjr1/19036175628.pdfIn PDF document text
    • https://cdn.sqhk.co/manuguwe/ic2Ftjc/55483440188.pdfIn PDF document text
    • http://allostar.buzz/wobevezumakejarigisiwozqtp6.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/B3ghYjb/day_designer_planner_2020_walmart.pdfIn PDF document text
    • http://arm-watch1.club/8366331443o48rl.pdfIn PDF document text
    • https://cdn.sqhk.co/kejofuvata/9gdG3ic/online_html_editor_code_completion.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zarevarepi.epizy.com/mindfulness_meditation_apps_for_android.pdfIn PDF document text
    • http://temekem.epizy.com/apostrophes_for_possession_worksheet_year_5.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_off0000e08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08B 5544 bytes
SHA-256: 25ce7acd35145e09af72013510bca8a1ce95c5df138c9152ed5b58073307dad7
font_01_sfnt_off0000f35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35F 10556 bytes
SHA-256: 3796b6d2fa75fb3d5e91e289c84db1de2546cd6d4ea855cfbb854d9e84e96f91

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