Malicious PDF — malware analysis report

Static analysis result for SHA-256 30f561432af48c9a…

MALICIOUS

PDF

69.9 KB Created: 2021-03-20 17:05:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b661352eb09d0746af7f8c455d2053f0 SHA-1: 1ff7b441473c438da509d14c06c0fbea407e6a88 SHA-256: 30f561432af48c9af6b465e7aafcc1ae0df71306ab5a310bfadc98c606700987
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain, suggesting a link farm for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings confirm its malicious nature. The document body, though heavily obfuscated, appears to be generated by wkhtmltopdf, and the presence of embedded URLs suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/123?utm_term=apsc+syllabus+pdf
    • https://cdn.sqhk.co/bewewojiwo/tgdzgeM/carx_drift_racing_2_car_list.pdf
    • https://cdn.sqhk.co/gozajare/jeAsyhb/96486585676.pdf
    • https://cdn.sqhk.co/semejegofip/jjcagem/44292981724.pdf
    • https://cdn.sqhk.co/limizolaxa/gigheig/sticker_maker_whatsapp_app.pdf
    • https://cdn.sqhk.co/vosevabuv/cqfpjcy/rosuvepugotu.pdf
    • https://cdn.sqhk.co/sozaxejiv/hcc8jfs/tisomuno.pdf
    • http://dekovag.mypressonline.com/bhagat_singh_biography_in_english.pdf
    • https://cdn.sqhk.co/matajikiwov/hiijijq/95714608272.pdf
    • http://mapenibo.scienceontheweb.net/antrenmanla_matematik_2.pdf
    • https://cdn.sqhk.co/madagijoj/jjapImd/10552556402.pdf
    • https://cdn.sqhk.co/kumexotiv/WuihiiY/24648261117.pdf
    • http://balegetiwep.mywebcommunity.org/tc_electronic_flashback_x4_delay_and_looper.pdf
    • https://cdn.sqhk.co/wobuwozavenu/2hgieie/kaxavogegebapigolukepowo.pdf
    • https://cdn.sqhk.co/jabosuve/3vQlEb9/chase_bank_canal_winchester_hours.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_f93d78435dd644d0a971423fc01a5bca.pdf?index=true
    • https://s3.amazonaws.com/rikolesafuwofar/internet_manager_firefox_64_bit.pdf
    • http://vugugemo.atwebpages.com/persuasive_essay_example_high_school.pdf
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_2848c733f70043a8a35b7fef9188546d.pdf?index=true
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_36ea883e88ac4776b3b475478e6b7083.pdf?index=true
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_74bf6b0aaf1443f1a92870890a49f1cd.pdf?index=true
    • https://s3.amazonaws.com/sedowedi/dyson_ball_animal_2_vacuum_manual.pdf
    • https://9764c975-acb6-4bd5-a3ff-b1f4624bc9bc.filesusr.com/ugd/5bcb7b_276f33794c87452bb762d89544ad44f2.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_off0000c885.bin
400ac286f02cd644b4c8d596c6064cf144b2e62c7638fc0b4c252b04f0131d60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC885 4704 bytes
font_01_sfnt_off0000d885.bin
4f4e9fc1599664e573a8e6a4f2a41d2d7c1049e28c2764f188195cda8b218bfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD885 10548 bytes
font_02_sfnt_off0000fc08.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC08 4324 bytes

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