Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b28631c27587f48…

MALICIOUS

PDF

88.0 KB Created: 2021-03-25 03:45:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9b87b1e4ac2fed3f044824e420dce808 SHA-1: 9abdfc5e9595e68cc4a571bed5bd92b071f904fe SHA-256: 8b28631c27587f4868b16ee43b416ab924f493b27fa8cb8d6cf354d6a123d469
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent link pointing to 'baarspo.ru' and a query parameter suggesting a lure related to car prices. The ClamAV detection and ML classifier strongly indicate maliciousness, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and extensive link farm suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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://baarspo.ru/strik?utm_term=ford+mustang+gt+2019+price+in+usa PDF link annotation
    • http://nebatomefov.scienceontheweb.net/dozinipujifif.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/91403017245.pdfIn PDF document text
    • http://zetumitufam.mywebcommunity.org/ecotourism_2020.pdfIn PDF document text
    • http://mamubisuk.mypressonline.com/anomaly_detection_in_data_mining.pdfIn PDF document text
    • https://cdn.sqhk.co/tekuligote/Zxjhgha/xemuzigepewa.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/ifhaiQf/wolf_simulator_2016.pdfIn PDF document text
    • https://cdn.sqhk.co/kofatuziwu/bghzrSD/the_wolf_simulator_best_skills.pdfIn PDF document text
    • https://cdn.sqhk.co/vamosopon/dhgkx8i/dulojigalusisodul.pdfIn PDF document text
    • https://cdn.sqhk.co/dorejewibiz/t51hjWZ/call_ringtone_song_app.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/vitelitubovuluj/nudifosumezafubarososaxu.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/christmas_dingbat_quiz_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/37341449397.pdfIn PDF document text
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_32ef0343f28d418892bfce3431af6f9f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4607036-1152-49f0-b68a-2e1ede0b6169/how_to_fix_hp_printer_problem_on_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/remiputowavobugu.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/chatuge_lake_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/blobfish_eat_information.pdfIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_e1f24f10e1ae4186b58adf92046af1a5.pdf?index=trueIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_361b926f592c41edb1521becc1a86171.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sigobija/buzup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21a543f3-4d40-4301-b832-b249ef733de6/70576822934.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/airdrop_from_android_phone_to_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/26336286435.pdfIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_1df7d69c296940ea88669b55b0b3ee98.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/calomel_electrode.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_off000119e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E9 5800 bytes
SHA-256: 18ffee1f4984eb97791da64bb87a6041d165ebdfc992aba86a87e80d0ea535ef
font_01_sfnt_off00012d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D96 10572 bytes
SHA-256: a6a6b6f696761e637ff795b6587b2a3db53ae30fca05d5cbbfceb23b3b20f995

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