Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10814f6cb01bd36…

MALICIOUS

PDF

86.4 KB Created: 2021-03-27 14:21:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 874f6598154c86905138170c820ffacd SHA-1: b0c6309adb418d46295237901ac041f3d184ec78 SHA-256: d10814f6cb01bd361d0310d1e39e7e28fa4a64749a2f96ca05b14c392445cbca
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, suggests a lure related to 'ms bolt weight chart pdf'. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest this PDF is used to direct users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://fokemale.ru/award?keyword=ms+bolt+weight+chart+pdf
    • http://about-central.com/75313527200lulb7.pdf
    • http://banquepopulaire-fr.org/age_of_empires_2_multiplayer_crackydhdp.pdf
    • https://static.s123-cdn-static.com/uploads/4373261/normal_5ff98344dd39b.pdf
    • http://bubble1.space/uc_browser_apkpure_201731zm6.pdf
    • http://komaxinatobofe.medianewsonline.com/what_is_my_love_language_meaning.pdf
    • http://xrootunited.com/coach_quotes_basketbally1vj7.pdf
    • http://lenugaguv.medianewsonline.com/how_to_use_thinkorswim_desktop.pdf
    • http://erogan-columbia.site/beach_survival_island_2017_savage_2_mod_apkgvvhe.pdf
    • http://pasadurasasagi.medianewsonline.com/libros_apocrifos_macabeos.pdf
    • https://cdn-cms.f-static.net/uploads/4455376/normal_603a0858e7324.pdf
    • http://tuwasukam.getenjoyment.net/how_do_you_write_an_impact_statement_for_a_car_accident.pdf
    • https://cdn-cms.f-static.net/uploads/4414860/normal_60581c2617d22.pdf
    • https://cdn-cms.f-static.net/uploads/4450907/normal_6034eb07aa8fe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://591e60e9-54e8-4b06-a9a7-f2e0522969d0.filesusr.com/ugd/1fd4b7_639101a968b046168650fe4545ae7c31.pdf?index=true
    • https://s3.amazonaws.com/subopukomanaw/what_should_i_make_for_dinner_tonight_generator.pdf
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_d92805fbe5ba4fb2b56e1f2c50631f83.pdf?index=true
    • https://s3.amazonaws.com/mipeboro/95843609250.pdf
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_1cc557a967f54a95b9430ef728bac073.pdf?index=true
    • http://diwavubodinaroj.myartsonline.com/how_to_use_kenmore_warming_drawer.pdf
    • https://s3.amazonaws.com/gafedupeba/the_power_of_now_audiobook.pdf
    • https://s3.amazonaws.com/pafiganovavi/toxefep.pdf
    • https://s3.amazonaws.com/jebokizez/jokemobafimidika.pdf
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_57a61c2d04154952b7690750716a1910.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_off000102ee.bin
8b14c88883e914591a51bb6553cf733adbded12655fcb500b54f9c6c8e6cbc00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102EE 5336 bytes
font_01_sfnt_off00011539.bin
3fc1cfcfd5522fc44bb0e58213e37250353b4696a745f6312b6d6ddc11b06bce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11539 11584 bytes
font_02_sfnt_off00013cc9.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC9 4324 bytes

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