Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b30f8c2644f765…

MALICIOUS

PDF

71.8 KB Created: 2021-02-08 15:05:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a31c716986c08a4cb6e86b51253f284a SHA-1: cb1754f003b2742459d45e7b609d8322f16d7ef3 SHA-256: 87b30f8c2644f76571059089fb7cf734d6e4a5b4f9dc9a3c51c4d872bacc0433
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 link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains keywords related to medical topics, likely used as a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wb?keyword=absceso%20hepatico%20piogeno%20pdf%202018 PDF link annotation
    • https://cdn.sqhk.co/midubevine/Ijjgngc/best_shudder_movies_july_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/diwiporeb/jchetid/french_vocabulary_builder_book.pdfIn PDF document text
    • http://specialsale.info/latitinitejilojiximiginanwe9ua.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/hjijhip/fotemilokamonivobatagi.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/dgfjj3p/free_slots_play_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372076/normal_5ffa322320306.pdfIn PDF document text
    • http://grenkasalo4.xyz/ff14_fieldcraft_demimateria_3_farmpo7c7.pdfIn PDF document text
    • http://mamontov-net.cc/nome_dos_androides_de_dragon_ball_zm0alv.pdfIn PDF document text
    • https://cdn.sqhk.co/delojiwuguj/1D52jgL/82676966698.pdfIn PDF document text
    • http://shoop-fp.ru/xefenuwiwgsh0.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/ciMVjdq/story_save_for_whatsapp_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490752/normal_5fd65b05c8a11.pdfIn PDF document text
    • https://cdn.sqhk.co/wuladupuzo/gbaggjf/savumeriwikokexulekusub.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/sepovutapakogaf/ludewatubawefotugifat.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_off0000d781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD781 5936 bytes
SHA-256: ca805020c644f8b9e3184355c37515bedef9a24ecebf406f06f1918153e06374
font_01_sfnt_off0000ebb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB9 11760 bytes
SHA-256: 89d16a59f1ab7a3c0b553c4b913aee9797546c0579fdea7755d5b57d8950f8fe

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