Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3db30c08a222f16…

MALICIOUS

PDF

74.6 KB Created: 2021-03-22 20:31:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f14be5494b69f54034e51a7db3742396 SHA-1: 1d71c6b34121c9d5b80d2c49094963c37a6520f3 SHA-256: b3db30c08a222f1698f45033c447e57f60a8fd4e22031af81c91055ee9616cd4
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, and is also detected by ClamAV. It functions as a link farm, containing numerous embedded URLs that likely lead to phishing sites or malware downloads. The primary attack pattern involves redirecting users through malicious infrastructure, as evidenced by the critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://dafemum.ru/award?keyword=waterlogging+in+your+locality+importance+of+project+pdf In PDF document text
    • http://budofibo.mygamesonline.org/love_story_movie_telugu_teaser.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/6Njefjg/bogozivomugof.pdfIn PDF document text
    • http://getegenufiduso.66ghz.com/video_barongan_kademangan.pdfIn PDF document text
    • https://cdn.sqhk.co/soribivevi/ggRgiji/nick_cordero_covid_19.pdfIn PDF document text
    • http://tokepubex.getenjoyment.net/gineletukusito.pdfIn PDF document text
    • https://cdn.sqhk.co/lokiwejawe/hgjnhji/archery_master_3d_download_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/diiCB3p/history_of_civilization_2.pdfIn PDF document text
    • https://cdn.sqhk.co/risinibigasi/zgjid6x/chb_number_full_form.pdfIn PDF document text
    • https://cdn.sqhk.co/ranotigu/jijeXSu/dotimuzuxasupukezisumemiv.pdfIn PDF document text
    • https://cdn.sqhk.co/govuzupikiwe/YhifUlK/taptap_global_ios.pdfIn PDF document text
    • http://sefobadivura.iblogger.org/gorelivotavigirotobiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xujided.onlinewebshop.net/vokozoxedavumuxebupobuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39964cba-2dba-45b9-8554-22d990a0b00d/serizejudizimul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de0a7b25-ae68-488d-b2a1-d3103a582d87/how_to_define_a_logo.pdfIn PDF document text
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_7d4c3897c2564ee4a90ebe9f0f088763.pdf?index=trueIn PDF document text
    • http://gidozapufemogig.epizy.com/benefits_of_reading_novels.pdfIn PDF document text
    • http://jopiwutipav.epizy.com/hemothorax_guidelines_bts.pdfIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_c9630552b02f47af95b2f4d3d8d8ceda.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE567 5488 bytes
SHA-256: dca1596841238e5532b316c85acbff0713c4a790e0500c385013b39f381a0837
font_01_sfnt_off0000f819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF819 10736 bytes
SHA-256: 52fb1ba11c409981f69422eb470035b7b4cc1f33e0fb4dcabb39ecb9e0515f6e

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