Malicious PDF — malware analysis report

Static analysis result for SHA-256 74d822a0557408d7…

MALICIOUS

PDF

82.2 KB Created: 2021-03-16 11:18:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d14fd0cf85018e51915ce143bade3b1 SHA-1: 91c48496278ceb2d12b084e7ddf7bc555abe4e1f SHA-256: 74d822a0557408d75ec998bb1141991917ab6c4d511d25848bfcc0994b6b08fc
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating a mass external PDF link farm, with numerous URLs pointing to external resources. The document body, though heavily obfuscated, suggests a 'newspaper layout' theme, likely a lure. The presence of external URIs and the ML classifier's high confidence score indicate a malicious intent, possibly to redirect users to phishing sites or download further malware.

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://leonvi.ru/award?keyword=newspaper+layout+pdf
    • http://xesapuwax.mywebcommunity.org/tp_link_powerline_forgot_password.pdf
    • https://cdn.sqhk.co/lesebonun/jhbibfs/cinematic_strings_manual.pdf
    • https://zulazuxalumino.weebly.com/uploads/1/3/1/6/131606396/xuxiwugorag.pdf
    • https://static.s123-cdn-static.com/uploads/4489716/normal_5fc81381cc360.pdf
    • https://cdn-cms.f-static.net/uploads/4469852/normal_6045690f5866e.pdf
    • https://cdn-cms.f-static.net/uploads/4465935/normal_604842857e91c.pdf
    • https://static.s123-cdn-static.com/uploads/4420237/normal_5ff408b050b94.pdf
    • https://nogeduju.weebly.com/uploads/1/3/1/3/131398368/8030449.pdf
    • http://sakulog.sportsontheweb.net/percy_jackson_and_the_titans_curse_full_movie_in_hindi_download_filmyzilla.pdf
    • https://cdn.sqhk.co/wepunajexiju/j8Agfie/neet_2019_answer_key_challenge_questions.pdf
    • https://jipofaxinevafud.weebly.com/uploads/1/3/4/3/134350183/9e92dc02ace.pdf
    • https://zuwojutiraz.weebly.com/uploads/1/3/4/7/134729165/topujaj-vosazeguj-gowumabusinur-duzexejinup.pdf
    • http://pojokup.getenjoyment.net/mogasipibiwemolejaboxer.pdf
    • https://cdn.sqhk.co/dadirowuj/JZh0Rgd/oppa_doll_premium_apk.pdf
    • https://fabuxitewuf.weebly.com/uploads/1/3/4/3/134349615/sexifuna.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_d6a55342ff3c4be48547f44c05453e8f.pdf?index=true
    • https://be5a03d2-cb36-429a-bb4d-4773f067dd3b.filesusr.com/ugd/b46ca8_6c82b3cddfa143a3b84d7cb7262e164e.pdf?index=true
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_26ad181c927f441fa09574e500fc33de.pdf?index=true
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_5fa2720cc23b4a37b661cd7d0c5519b5.pdf?index=true
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_317406bfc4eb4b27a18ed5db98da2676.pdf?index=true
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_6fba6cfa9f4142c6a79c9ef9a05b5350.pdf?index=true
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_a5f73568c2fb46d88ee143e13d24c848.pdf?index=true
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_ec66c46fe1e74186904af944fd1d845d.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_off0000f8db.bin
3816b7ab8f498450f19cbb14ef0f5f08cdb187e747fd085927f1ea789bed0e9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DB 4928 bytes
font_01_sfnt_off000109d1.bin
a4277dd46c44c4b15151a0f75d1bea938de75f20e175901c8f140d3a90377b8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109D1 10360 bytes
font_02_sfnt_off00012d02.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D02 4324 bytes

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