Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81affbf08f1c517…

MALICIOUS

PDF

80.5 KB Created: 2021-03-02 22:01:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6ce12a923489bb1ee3810ece23d42ac7 SHA-1: bc14e5b3b9351dfb40a158b06aa59d80ce290fa5 SHA-256: c81affbf08f1c51788f702a4e9711aa3fc5df80be265adc55d1db0a2cd1e34a5
176 Risk Score

Malware Insights

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

The PDF contains multiple suspicious links, including one that redirects to a domain associated with phishing. The heuristic 'PDF_SUSPICIOUS_LINK_LURE' indicates an image-heavy PDF with invisible links to a suspicious domain, likely intended to trick users into clicking. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://jumiwimov.ru/strik?utm_term=how+to+reset+lock+on+cannon+gun+safe PDF link annotation
    • http://optalpha.com/cerfa_10170_5uwpsy.pdfIn PDF document text
    • http://lowomiwikozura.22web.org/validation_transformation_in_sap_bods.pdfIn PDF document text
    • http://loginwithfb.site/how_to_put_the_top_down_on_a_ford_mustang_convertibleh590u.pdfIn PDF document text
    • https://cdn.sqhk.co/tuledapozato/gjhgiid/what_animal_are_you_really_appropriate.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/cannon_hotpoint_gas_cooker_manual.pdfIn PDF document text
    • http://show-visitor.xyz/international_law_master_in_ukvl9cx.pdfIn PDF document text
    • https://cdn.sqhk.co/duvapegoleva/ih8fgLD/the_open_university_of_hong_kong_qs_ranking.pdfIn PDF document text
    • http://pupezawat.scienceontheweb.net/what_kind_of_rope_for_tire_swing.pdfIn PDF document text
    • http://myyshooop224.site/kafupudelamumb0ei2.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/jobavo/pixabime.pdfIn PDF document text
    • http://wijegasijewen.rf.gd/customer_reviews_boll_and_branch_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/77496677054.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/poly_aromatic_hydrocarbons.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/7180995479.pdfIn PDF document text
    • http://wamigorudazuz.epizy.com/how_to_perform_fracture_toughness_test.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/fawesanikejavubasudikej.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF342 5164 bytes
SHA-256: 3111b51bac4f75a458a378d27d6bbba7369e4dca31a1c2b5dd7b15fa28afffeb
font_01_sfnt_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off00011057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11057 10636 bytes
SHA-256: 77b41c3efae114f9cd34616781cbb272f922dceea118aedf82681c967869648a

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