Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2521db9d26eb8cc…

MALICIOUS

PDF

69.5 KB Created: 2021-04-13 21:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12cc5363006cf85d060ffde4c9b27d8f SHA-1: a63e12427ec7c84e68feb8df2143a9b7bd1b9453 SHA-256: a2521db9d26eb8cc7c41047477015d66fb95d0f461112c9e5594325155a0d7b9
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, suggesting an attempt to direct users to potentially harmful websites. The embedded URLs and the PDF structure point towards a malicious document designed to exploit users through link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/strik?utm_term=how+to+load+paper+into+a+canon+calculator+p170-dh
    • https://cdn-cms.f-static.net/uploads/4369332/normal_601bdd92cec7f.pdf
    • https://cdn.sqhk.co/logenuzupug/0HMjaia/puzerijobovibebufid.pdf
    • http://zaparipajomigi.scienceontheweb.net/how_to_take_out_atomic_mass_of_an_element.pdf
    • https://bemiredo.weebly.com/uploads/1/3/5/3/135322707/dosefemepifela.pdf
    • http://tunabamilusi.mypressonline.com/44405919765.pdf
    • https://static.s123-cdn-static.com/uploads/4496571/normal_6001116bcf988.pdf
    • https://cdn.sqhk.co/pubamegumox/D6gfP6u/human_shield_shie_hassaikai_member.pdf
    • https://jumugixaz.weebly.com/uploads/1/3/6/0/136028190/3218735.pdf
    • http://rumafelaneli.mygamesonline.org/xomalugis.pdf
    • https://cdn.sqhk.co/jarixizotib/hiljh05/80124919587.pdf
    • https://tibijipobarak.weebly.com/uploads/1/3/4/4/134493900/puwiviguniruvepojug.pdf
    • https://damasijirezox.weebly.com/uploads/1/3/4/5/134528919/4b8933c6.pdf
    • http://sosogemizibu.mypressonline.com/aquella_orilla_nuestra_elvira_sastre_gratis.pdf
    • http://vonoxafaku.scienceontheweb.net/organizational_behavior_afsaneh_nahavandi.pdf
    • https://cdn.sqhk.co/vedimurami/pBZWhjL/2020_election_map_live_updates_cnn.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lobopekogolo.onlinewebshop.net/xepozifulawabinazepof.pdf
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_472cf4898c4a454dbdb6b526df3caebb.pdf?index=true
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_2f406e01b53c48c292eb6d4d788e0be5.pdf?index=true
    • http://zozupajekuledus.myartsonline.com/32041198386.pdf
    • http://jetotajasavesi.atwebpages.com/how_does_the_new_game_show_the_chase_work.pdf
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_1a1d44b7f61d4620a27ca5cb275e4818.pdf?index=true
    • https://5d55c623-01b0-417f-8131-8dfd0334080c.filesusr.com/ugd/9ef046_a41a02f7731d419fa48296c844c5d58a.pdf?index=true
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_dfe16aa3ee364b63a5e0850007946cc0.pdf?index=true
    • http://dowafirowelumex.atwebpages.com/buss_perry_aggression_questionnaire_bpaq.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_off0000d260.bin
af56794277e909945548e4182d903134298a8bd6d2ed37c311709e2666104769		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD260 5344 bytes
font_01_sfnt_off0000e4a9.bin
4e488e18f5255e403cdb89f4e9888bed1ac84397315d6ed51d03bce3fc8880b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A9 10516 bytes

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