Malicious PDF — malware analysis report

Static analysis result for SHA-256 350dda7e1c68b730…

MALICIOUS

PDF

77.0 KB Created: 2021-05-21 02:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d5605944af3823ed4f808f93abd0adaa SHA-1: d9383469d514d0f9fe9bfd103439dcbdb761fa7d SHA-256: 350dda7e1c68b7306b8b6092cf37dfcaaecfb85d71fd57e44e28dacda3d4f268
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged the file as malicious, indicating a phishing or trojan-like behavior. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://yafferge.ru/strik?utm_term=wooldridge+cross+section+and+panel+data+pdf In PDF document text
    • https://fekebejoluxoji.weebly.com/uploads/1/3/4/3/134309121/4142939.pdfIn PDF document text
    • https://kudezugomolalu.weebly.com/uploads/1/3/5/3/135331411/palal.pdfIn PDF document text
    • https://wudumimimi.weebly.com/uploads/1/3/4/3/134356267/wetoviv-lazerinutaje-gudegazedexu.pdfIn PDF document text
    • https://robubafo.weebly.com/uploads/1/3/4/5/134588337/5871023.pdfIn PDF document text
    • https://xemawegomefere.weebly.com/uploads/1/3/4/7/134736207/zakedixosukuzir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dofufiri/katirubalevopubin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18a88996-8b9f-42d8-b5ab-b17f8cd4ba72/nakebixojibogarafemoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b1840c2-8883-485f-80d2-bb4cbce77ee0/english_language_learning_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/sogokexumavave.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/budget_2019-_20_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6319577f-782e-42f1-898f-21f19dfa2363/html_programming_for_dummies.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/44203897473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11827787-ca45-4d6c-afbc-54bdf20e588e/mobylette_peugeot_103_rcx_a_vendre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fab3fdca-e1dd-49e1-8ff5-9cafc4bec4b0/weber_spirit_200_grillrost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b67dd72d-5ed0-478a-95dc-70de42118eb4/suxinuvilerif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1556849c-2d12-4b92-811e-694820986efb/kitchenaid_stand_mixer_sale_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4e9f465-9735-40ca-ac7d-e32743a24543/73409238433.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6444e45a-d98c-4e54-84b5-930ed899b873/50573793954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74bed574-db5b-4503-ba38-170f83c34a38/94159959498.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/vibug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70f501ec-5c0b-46da-a228-c82d6856f081/be_able_to_exercises_multiple_choice_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/556f27a1-7221-46b7-a85a-4de45089b1ad/where_can_you_donate_clothing_right_now.pdfIn 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_off0000ed03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 5336 bytes
SHA-256: 2fcf1a0b28c45942c142797dbfac2109ae09a2cfb0645ba0ac0fd362c119560b
font_01_sfnt_off0000ff4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4D 11332 bytes
SHA-256: 7bdaf56498ba37bf046e7332eeebfc239dcddbd72ccb66c0912ca0756e27881a