Malicious PDF — malware analysis report

Static analysis result for SHA-256 e839f20b47b836ae…

MALICIOUS

PDF

85.6 KB Created: 2021-03-16 11:10:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b4610c78de0705c8845160a742a91bec SHA-1: 8eef7c175b5d59357358604ff9e2dad9086f486f SHA-256: e839f20b47b836ae856db11e5bf8af4b07252b2276337962e3a12ee3ae82cd6b
254 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to redirector infrastructure. One prominent link, disguised as a search result, leads to 'https://crophysi.ru/strik?utm_term=what+is+the+meaning+of+contrast+in+art', which is flagged as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://crophysi.ru/strik?utm_term=what+is+the+meaning+of+contrast+in+art In PDF document text
    • https://cdn.sqhk.co/galemojubemo/1MUHKvS/space_colony_ark_map.pdfIn PDF document text
    • https://cdn.sqhk.co/tinawegu/im9ghha/40376736580.pdfIn PDF document text
    • https://cdn.sqhk.co/zesozote/eUwggOI/pictoword_level_60_answer_key.pdfIn PDF document text
    • http://betmoy56.com/50973358775w7z1h.pdfIn PDF document text
    • https://fekodajitor.weebly.com/uploads/1/3/0/8/130874258/visewetoke.pdfIn PDF document text
    • https://komomagifagele.weebly.com/uploads/1/3/4/7/134705279/9077096.pdfIn PDF document text
    • http://idslim-italia.site/polaroid_tab_hard_resetkat4u.pdfIn PDF document text
    • http://bu-markett.com/ashton_net_worth5bftf.pdfIn PDF document text
    • https://cdn.sqhk.co/vidujubotaf/npia9L3/91658010173.pdfIn PDF document text
    • http://forexgeeks.net/16544071772edo41.pdfIn PDF document text
    • https://cdn.sqhk.co/fapulelenuvi/jahDjbq/rumble_strips_on_roadway.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/lokijuronig/94127257831.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/ligojokizinomujomilap.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/jidexilupepis.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/adventure_capitalist_mod_apk_7._6.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/bavifuko.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/copd_treatment_guidelines_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/81056281552.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/20451575315.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/jurnal_adversity_quotient.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_off00010ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC7 5276 bytes
SHA-256: b0b32bab71f660e86f7294b85481c68a97fd3efb7a0932fb75e6513656720880
font_01_sfnt_off000120a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A5 11516 bytes
SHA-256: 7ee4294dd64a908a9d9b15754181899f4f7073f4eaaeae1b9d8bb2ef71e08055

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