Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3387ad7e2a0209…

MALICIOUS

PDF

90.0 KB Created: 2021-04-01 01:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9dc965ee346e33ef9a2cd41514a1ba02 SHA-1: a0756965b0d4251ed03edf6e977e59c8bd473bac SHA-256: bb3387ad7e2a02091d03c78348403adc246e59cd29e73d7d4591ff660a48484b
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 are SEO-themed, suggesting a link farm or phishing attempt. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external URIs indicate an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/wix?keyword=your+blood+never+lies+pdf
    • http://femalukus.iblogger.org/spanish_sentence_structure_in_english.pdf
    • https://cdn.sqhk.co/laxiroroweno/hhjgdHA/52083805386.pdf
    • https://cdn.sqhk.co/vudupapuj/jAsVibp/what_happened_to_white_stripes_drummer.pdf
    • http://munumizirukotek.iblogger.org/tigaxijitusorosuw.pdf
    • https://cdn.sqhk.co/mejeteboxav/icgcjfg/temple_run_3_game_car_video.pdf
    • http://lologunaw.mygamesonline.org/vadejonotasinak.pdf
    • https://cdn.sqhk.co/puwidebudojo/oG1Yijj/54272189778.pdf
    • https://cdn.sqhk.co/sesedazaw/5jggdEQ/47908819482.pdf
    • http://vitetiw.getenjoyment.net/durga_saptashati_parayanam.pdf
    • https://cdn.sqhk.co/fofasafiwi/MigjjdA/wallpaper_for_pc_4k_gaming.pdf
    • https://cdn.sqhk.co/tegimatararo/Ba9sico/69935223893.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xebedosifemopan.epizy.com/what_is_the_best_denture_adhesive_powder.pdf
    • https://34ec465e-51aa-4dba-9a8c-c05fcfb5ae84.filesusr.com/ugd/df15ee_f9677e9e9d724bdf8b13fb014ed6187f.pdf?index=true
    • http://kupuwatuz.epizy.com/craftsman_18_42cc_chainsaw_spark_plug.pdf
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_28a84bafc0c940d28a97fcf8a6ad9abe.pdf?index=true
    • https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_4dfca80fe9cc41fa81e0a81ee2d4999f.pdf?index=true
    • http://dikazimizoban.epizy.com/past_simple_regular_verbs_games.pdf
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_d6f134d4afcf437fa571ad6e476e4440.pdf?index=true
    • http://falivodekolulo.epizy.com/fasujinopunepem.pdf
    • http://wupidusujimi.myartsonline.com/modelo_canvas_definicion.pdf
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_e36ffa513db642b19bc629685607052b.pdf?index=true
    • http://ligoroxenafof.atwebpages.com/kiran_publication_bank_clerk_books.pdf
    • 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_off00012483.bin
0a5f50df41f08b993def52320b3e87b80f37a3dcba852571b4d2c40ce70b2456		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12483 4988 bytes
font_01_sfnt_off0001358a.bin
9cebe2d92be23467861c32b70b9012161b9dc7312318d35dad8ed560bb8788f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1358A 10820 bytes

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