Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec43a69e31c795a7…

MALICIOUS

PDF

73.7 KB Created: 2021-04-01 18:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8ce754e1293b57682e03026e9d3de18 SHA-1: 9e532670bc015e466877313746afd1373963c0a1 SHA-256: ec43a69e31c795a78ab6787b6ccb58f3e46e2e6aecf474bdefa815641da4b3ac
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, flagged as a 'link farm' and indicative of phishing or SEO poisoning tactics. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xezojetit.ru/strik?utm_term=el+coronado+hotel+ensenada
    • https://cdn.sqhk.co/wolowivem/hjgihfK/catfish_near_me_irving_tx.pdf
    • http://belplitka.ru/steamship_authority_nantucket_terminalteq6t.pdf
    • https://cdn.sqhk.co/rinugezig/9Ogf0eO/53350819387.pdf
    • https://cdn.sqhk.co/nupasoxure/iagfw3a/laliko.pdf
    • http://obschee.xyz/xaloxofofasb3nn.pdf
    • https://nutiduvurenomal.weebly.com/uploads/1/3/4/6/134681926/fuvajuvamu.pdf
    • https://wopufibirebosaw.weebly.com/uploads/1/3/4/4/134466277/c5b83878ee27c0.pdf
    • https://cdn.sqhk.co/ninulekuto/KhhgcAa/jikakowisirom.pdf
    • http://jeruxawi.iblogger.org/sociology_of_religion_contemporary_developments.pdf
    • https://cdn.sqhk.co/rifarako/H9jgLgh/cross_stitch_pattern_creator_app.pdf
    • https://jifefovemerozix.weebly.com/uploads/1/3/4/4/134444698/5570372.pdf
    • http://zoo-taxi.site/calendario_judaico_2020tgccj.pdf
    • http://nibelv.xyz/faiths_of_eberron_3.5fl9t0.pdf
    • http://wovoradomumakil.medianewsonline.com/98221067032.pdf
    • http://de-bewertung-889562.icu/21376298601vmtqr.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2c170d09-f735-4b79-9cf5-d656c2ac4eef/the_girl_with_the_dragon_tattoo_movie_plot_summary.pdf
    • http://pemulotik.epizy.com/littering_effects.pdf
    • http://wutejaxevewef.myartsonline.com/z_score_table_up_to_10.pdf
    • https://uploads.strikinglycdn.com/files/987bf80a-939d-4b7b-8cc9-8a8dfd13f1ca/letijufaborogoxo.pdf
    • http://tabizamasozelo.epizy.com/jalesanobelokipegopewude.pdf
    • http://zotubune.myartsonline.com/pofoxuni.pdf
    • https://uploads.strikinglycdn.com/files/c4a2e98d-0ffd-4755-9641-0cf4fcda9b0f/kupuvuf.pdf
    • http://dorenibe.rf.gd/embodiment_design.pdf
    • https://uploads.strikinglycdn.com/files/2701c0d7-0061-479f-8c8b-5d779a651f25/3256337083.pdf
    • http://wamulax.epizy.com/java_programming_notes_download.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_off0000e33d.bin
94fbeeb02c2b01cc4b7e99624fc5bc5218346329d3be23d3d69fbaa5823aee82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE33D 4984 bytes
font_01_sfnt_off0000f423.bin
498aee66b664ccab95430e6c4b9961828b0da41e0dd154c146a17e62a53d0b46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF423 10832 bytes

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