Malicious PDF — malware analysis report

Static analysis result for SHA-256 29e08255153f8a2c…

MALICIOUS

PDF

79.1 KB Created: 2021-04-01 15:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5797edcef18b800120d55c86fff22181 SHA-1: 18407e8b4d5c4c2532f45126439604d1d3767536 SHA-256: 29e08255153f8a2c0f145d6daef79bd4f4c9132247fd4dc0c351ed8c08ed34b2
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. It contains numerous external links, including a link farm heuristic, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to a 'Kiran bank reasoning book pdf', likely a lure to disguise the malicious intent. No scripts were extracted, but the presence of external links and the overall heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/award?keyword=kiran+bank+reasoning+book+pdf+in+english
    • http://naturalm.space/wheel_of_fortune_game_show_quoteszkkpf.pdf
    • http://keepxufi.space/liwogitoljhv5.pdf
    • https://cdn-cms.f-static.net/uploads/4368242/normal_605ef72cb4b55.pdf
    • https://cdn-cms.f-static.net/uploads/4413980/normal_6023e3b75599c.pdf
    • http://jezuxomedoz.iblogger.org/vikelamanoxelakeb.pdf
    • https://bagobizofenagex.weebly.com/uploads/1/3/4/7/134767931/nadeb.pdf
    • http://lejunuzegakikuv.mypressonline.com/jonoxumuxujosivawet.pdf
    • https://cdn-cms.f-static.net/uploads/4420764/normal_604dd6a7bad0b.pdf
    • http://lightsex.ru/nisovefxko.pdf
    • http://nesorus.mywebcommunity.org/four_syllable_words_list.pdf
    • https://temisufe.weebly.com/uploads/1/3/5/3/135384001/josadikur.pdf
    • http://tujozavido.66ghz.com/mipipeguduzerupuzajugi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://165abacb-5525-4e66-971c-c167d859e756.filesusr.com/ugd/f3f2a5_2afd98b307c44dfba8ac696155190c26.pdf?index=true
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_f5f5759874904167bf3d28d9abae4bdb.pdf?index=true
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_2b8a701b0c5d48f9be80317ad2482f07.pdf?index=true
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_2870680221944e5894bb8e08962f8ce2.pdf?index=true
    • https://de7eff9d-5c50-4122-bb99-ee112abf7a8f.filesusr.com/ugd/db8f21_f257de40692f43f8a91cd9b0660ab78b.pdf?index=true
    • http://mupevisad.epizy.com/20173154749.pdf
    • http://kesobikifa.epizy.com/physics_with_calculus_1_cheat_sheet.pdf
    • http://pimoxonevuwewax.atwebpages.com/zajemunowuzikiz.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e177.bin
eb01084374f627a491a846d05564fb015ee5fe4ff2672bab10be7e85de973011		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE177 5476 bytes
font_01_sfnt_off0000f409.bin
c59e89418c166de05cfe607f8e4e2b3453d72cc83962447f43b12569e76c1760		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF409 11192 bytes
font_02_sfnt_off00011a65.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A65 16204 bytes

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