Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17c1ae430543536…

MALICIOUS

PDF

89.5 KB Created: 2021-03-24 10:29:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c40bcbb3a15eaf3ef239db5ce9ddd825 SHA-1: cef9d8b06bddaf77480e9d114e37020aeeb9228e SHA-256: c17c1ae430543536031ab4db5f5b6a4526ecbfeeb621dc363d634be933443fba
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, suggesting a link farm or phishing attempt disguised as a free download. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

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://maypoin.ru/wix?keyword=usmle+step+1+made+ridiculously+simple+pdf+free+download
    • https://kivenawuvu.weebly.com/uploads/1/3/1/1/131163776/2f2ef5e5c.pdf
    • http://viwavidif.getenjoyment.net/kilodugob.pdf
    • http://wiinorama.website/app_store_not_ing_xcodebgs5n.pdf
    • http://itverys.space/how_to_make_simple_barbie_doll_housewbj91.pdf
    • https://nepuvojikonutoz.weebly.com/uploads/1/3/4/6/134677469/nakejavede.pdf
    • https://cdn-cms.f-static.net/uploads/4454819/normal_600fed26c26e3.pdf
    • https://torurukiruxo.weebly.com/uploads/1/3/4/5/134529807/8065916.pdf
    • https://cdn-cms.f-static.net/uploads/4403406/normal_6057b27f5fcbc.pdf
    • http://mastera-saydinga.ru/ok_ka_full_form_kya_he4dgol.pdf
    • https://kupugaxome.weebly.com/uploads/1/3/0/9/130969415/6140dc.pdf
    • https://cdn-cms.f-static.net/uploads/4450439/normal_6039eeb996e87.pdf
    • http://nevinidonet.mywebcommunity.org/easy_tabletop_rpg_systems.pdf
    • http://zofunubesosena.mypressonline.com/90828455425.pdf
    • https://cdn-cms.f-static.net/uploads/4450340/normal_5fd7181042a19.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_0f7447f9c90a4162970836a65b2da50f.pdf?index=true
    • http://perexuwofogefo.onlinewebshop.net/83776253821.pdf
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_a7b0788079d645e0b307ebba5df88310.pdf?index=true
    • https://5637a596-61ce-4e67-8953-8fd9cb84b940.filesusr.com/ugd/c20ea7_af1fb536d5f34f26a2a644bfc2cbc5b0.pdf?index=true
    • https://c220b530-f0c3-41ae-b07c-f0ad1ac24ac4.filesusr.com/ugd/a64c8c_e8a87224537442189421b2ead482d5af.pdf?index=true
    • http://sevavaxup.rf.gd/ali_baba_40_chor_story_in_english.pdf
    • http://velumosak.epizy.com/muvodidowuwukoduvipeji.pdf
    • http://vujadexofon.atwebpages.com/bowosuxemog.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011aad.bin
a345086556388f525355af2552ac27a664eae2818ff68c5a99317cdeae66969c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAD 5540 bytes
font_01_sfnt_off00012d89.bin
56b176f524993a4536389de4ec20c5859841c4b02b2c69b8f724ef71519b156a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D89 13092 bytes

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