Malicious PDF — malware analysis report

Static analysis result for SHA-256 18401722af2aa202…

MALICIOUS

PDF

80.1 KB Created: 2021-03-18 03:44:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2b2bda4c6f1922ce3efff4cefd69094 SHA-1: 7ba5d2cdf29af225c03e3f19b8cc710c7a90462c SHA-256: 18401722af2aa20220110ca79b256014f0eee7b438ba5fd06d5baa251e72b593
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically classified as a phishing trojan. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://nipisod.ru/strik?utm_term=how+to+adjust+shower+temperature+delta
    • http://sudilufib.getenjoyment.net/convert_adobe_to_word_document_free.pdf
    • https://cdn.sqhk.co/fujotojaxob/bhjjfLJ/ludo_champ_game_download_apkpure.pdf
    • http://vazifesi.iblogger.org/4liker_app_update_version.pdf
    • http://vebuwovivulab.mygamesonline.org/compress_large_file_size_online_free.pdf
    • https://cdn.sqhk.co/xaduwudixum/fhaif0M/king_bollywood_actress.pdf
    • http://manaluw.iblogger.org/puturimuxovojirotomod.pdf
    • http://xejapuz.getenjoyment.net/jumbo_activity_book.pdf
    • https://cdn.sqhk.co/pajokiman/E8jijgc/granny_barbie_mod_texture_download.pdf
    • http://kefudepoduwudi.sportsontheweb.net/watchmen_script_2020.pdf
    • https://cdn.sqhk.co/bomaguvodar/hbjVlji/sepsis_in_pregnancy_nice_guidelines.pdf
    • https://cdn.sqhk.co/japedovak/jZzyh2l/big_joe_wine_glass_cougar_town.pdf
    • http://nopezimugabotik.mygamesonline.org/fitobaga.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_4eea9caf7ad542c4bb4e501b74aa6c65.pdf?index=true
    • http://luwulifinuneti.epizy.com/59877464541.pdf
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_a95f789d102a48d1b0f16b16390422d3.pdf?index=true
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_2bf7451fc0d94a03b7ae7ab07d6eb377.pdf?index=true
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_3abd057950a04cfea49dc332d0dc50cc.pdf?index=true
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_9a26a3ef598841e58dd57730aa55e7b3.pdf?index=true
    • https://b46c4cda-4951-41c0-816f-bbf02eee4d9b.filesusr.com/ugd/4ff992_4a38f30d6ade41349b89c68448834a7c.pdf?index=true
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_b08c57ae61114f23b2bbf82937dc5df3.pdf?index=true
    • https://2cc12256-1025-444a-bacb-901a9f007bda.filesusr.com/ugd/d1fcfc_48af7f374a974d5b893680c721fab4e5.pdf?index=true
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_cd6025891eef44ff9d8f757f38789e47.pdf?index=true
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_be85c20a4d6b456a9869b67d34ddb353.pdf?index=true
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_31a1991658af466387a228eff589f3a6.pdf?index=true
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_0fede9ed9c88454288aae37209b7c492.pdf?index=true
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_9f8f04504c58499f9f86f878a02aa8fe.pdf?index=true
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_763b9eb15c08464590d8ee6db326de05.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed88.bin
cf631ed66e454c43cff319c21ea9ae04c6b0f4482e502eb86eaa694842a84c83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 5056 bytes
font_01_sfnt_off0000fecf.bin
492db7aaf76de5adb4323ec70904bfc2f32ce47216854960855af55f5bcc9696		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFECF 10924 bytes
font_02_sfnt_off00012435.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12435 4324 bytes

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