Malicious PDF — malware analysis report

Static analysis result for SHA-256 acbdef27d48aeb5f…

MALICIOUS

PDF

85.0 KB Created: 2021-04-10 17:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 978ef904fc26f5c4d77aa718830c68ac SHA-1: 8a1399fcf7d43946edb1a8a9adb863e1549ee183 SHA-256: acbdef27d48aeb5f9d7c3227c29e0d6ede194ab206ba91dbc8ba2a4839612bd5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm designed to direct users to a large number of other PDF documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=barthes+death+of+the+author+pdf
    • https://cdn.sqhk.co/bilanogakiw/bAI7Cgd/iron_it_out_pharmacy.pdf
    • https://cdn.sqhk.co/sozaxejiv/jAqhcjd/26502325108.pdf
    • http://bonboxstudio.com/tawave5lbk7.pdf
    • https://cdn.sqhk.co/kekotenonaxu/hhhchdZ/sas_zombie_assault_4_hacked_android_download.pdf
    • http://craftsmansmetics.com/panasonic_genius_sensor_1250w_microwave_partswikmq.pdf
    • http://fitokapss.xyz/android_10_for_samsung_phones3b4cn.pdf
    • https://cdn.sqhk.co/rorexamuviz/he2hbjj/kodipiwatubasasezur.pdf
    • https://cdn.sqhk.co/wobuwaseja/DYhfiaN/fishing_bait_life_hacks.pdf
    • http://djami.ru/zojiwojrbf2.pdf
    • http://itclick.info/xemeponik0vrag.pdf
    • http://sandiego-podcasts.com/13421805897vhxo7.pdf
    • http://peguxukeziku.sportsontheweb.net/adolescent_health_care_a_practical_guide.pdf
    • http://rfs.team/vabewrawt0.pdf
    • http://ogranifruit.space/33654529480a7d5m.pdf
    • http://evromotors.net/12074554464cyze7.pdf
    • http://sneakerspapa.store/xutumirazanurcavat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_ab8a613cf98c4d0693f91ce1a827476f.pdf?index=true
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_c3d55c21011242ca9097d7355fb46dfc.pdf?index=true
    • http://nevafofuvabovid.atwebpages.com/lafik.pdf
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_c0f898be988746048f6ba89b8ccfd64f.pdf?index=true
    • https://67acb2b6-3e42-4063-a073-371cb527a15d.filesusr.com/ugd/a81d48_cf2c83107cb344429689611ba15fac4c.pdf?index=true
    • https://b724dda4-e2e0-47c5-811c-ae3b7273578b.filesusr.com/ugd/a1e5ee_1144139d548b44fe95f436e57a7f64c4.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dc6.bin
cbcdd70cb4dea283f3b14e101659fbce9de0d5f63730ec2f456ca179cd07391e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC6 5144 bytes
font_01_sfnt_off00011f42.bin
07763089e8800e68074f3030877440137f2ff101dc84e05d0081a0a2f0b966d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F42 11128 bytes

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