Malicious PDF — malware analysis report

Static analysis result for SHA-256 394d839c7aea32de…

MALICIOUS

PDF

97.2 KB Created: 2021-03-24 13:21:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 062104bdfe4676ecff26faefde82170c SHA-1: a3d50501c81dd3c3e022e92d351ce97542dd76ea SHA-256: 394d839c7aea32de4c08c85ae48eb5c2140f5cdaa4b976e9b9bee0bd22ecaa4c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm designed to improve search engine rankings for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/123?utm_term=adobe+reader+pro+for+pc+free
    • https://dokegofixak.weebly.com/uploads/1/3/0/8/130873830/kepegudu.pdf
    • http://biomaniks.website/what_courses_do_you_need_to_be_a_vet_teche940t.pdf
    • https://vajinivokesele.weebly.com/uploads/1/3/5/3/135326698/dekizipojof-kuvona.pdf
    • https://cdn.sqhk.co/tinulafi/ltplkii/jajexekewesajirinisakef.pdf
    • https://zumuwezejulo.weebly.com/uploads/1/3/1/4/131455722/vadutototosesisavu.pdf
    • https://bobiputab.weebly.com/uploads/1/3/2/8/132814039/4f2d565b8f5c53.pdf
    • http://lnstagramcentre.net/36433507879cklc1.pdf
    • https://cdn.sqhk.co/bojidokagivi/jjgfhaw/better_camera_quality.pdf
    • https://cdn.sqhk.co/tirabipati/hiidhd3/grh_la_gestion_des_ressources_humaines_en_action.pdf
    • https://lofokuvowuvi.weebly.com/uploads/1/3/4/3/134362742/wokerupasazexu_wazedaxi_kexed.pdf
    • http://milanomoda-italy.site/24849046366wacrw.pdf
    • http://cabinetsly.xyz/photoshop_brushes_grunger8nfe.pdf
    • https://cdn.sqhk.co/savujegu/dbieh0L/rurolo.pdf
    • http://timelessdecorum.com/the_house_of_the_spirits_isabel_allende_vkwhq1r.pdf
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kefiperizonofu/xibebenufapubesovubiviwos.pdf
    • http://fuxezol.rf.gd/breath_of_snow_and_ashes_timeline.pdf
    • https://s3.amazonaws.com/zalisujezajaje/doraemon_cartoon_song_mr_jatt.pdf
    • https://s3.amazonaws.com/mokamoba/what_do_the_symbols_mean_on_mitsubishi_air_conditioner_remote.pdf
    • http://zudejemil.epizy.com/xagovuxameju.pdf
    • https://2a009ac4-5770-49f2-ae16-4ce107243443.filesusr.com/ugd/59deca_79c06babf8d54bf6b78185522059f76f.pdf?index=true
    • https://s3.amazonaws.com/bisazabe/33341471374.pdf
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_33f5ba7265d74f8ba8ffcd8c2b46411e.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://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011260.bin
3233822616a2c572ff79a66234151afda3055bc9163059b9121cdc399bb0cb57		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11260 13388 bytes
font_00_sfnt_off0000ee62.bin
9553b852ba66d858596c52237ff0706371c74e4d8f960d5c434dd649c2606cf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE62 5336 bytes
font_01_sfnt_off0001011f.bin
ea048aac8b62cf1406cc831a251d3fabcc7ba6c42663324655ef9eac54d979a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1011F 5068 bytes
font_03_sfnt_off00013748.bin
6f480e7b681c64a65452c90eb46ea174e0ca43a1440d4e1ece4fe9b94cd19810		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13748 11992 bytes
font_04_sfnt_off00015e1d.bin
1d240a0535f2140f7c954fae970985d54487e451ba4ee00a2f6f8a8e98c285da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15E1D 16488 bytes

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