Malicious PDF — malware analysis report

Static analysis result for SHA-256 105c840d9d41b6a2…

MALICIOUS

PDF

73.4 KB Created: 2021-02-22 05:05:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 917f9b88c30e1859c6bd120c4813ec85 SHA-1: 80da819db9b24700039fd8d1ebebdf897cd02144 SHA-256: 105c840d9d41b6a229d25814ac66a3759fbafb7eaecd26d88f7a2452941c1132
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm designed to distribute traffic to various potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://seumenha.ru/strik?utm_term=let%2527s+explore+diabetes+with+owls+chapter+summaries PDF link annotation
    • http://sport-stavki.fun/29432165170hy111.pdfIn PDF document text
    • http://grandov.pro/arduino_startertydlm.pdfIn PDF document text
    • http://electrumwallet.buzz/retrowave_font_makeruvisl.pdfIn PDF document text
    • https://tavutapakewig.weebly.com/uploads/1/3/5/3/135399939/9266384.pdfIn PDF document text
    • https://betivaronapan.weebly.com/uploads/1/3/5/3/135350750/muxexabef-vodijeku-jewotika.pdfIn PDF document text
    • http://megalit-korolev.ru/chicken_pouches_canadaf85qy.pdfIn PDF document text
    • https://ziregorex.weebly.com/uploads/1/3/5/3/135351653/33fef13cd213b.pdfIn PDF document text
    • http://mugowewu.22web.org/woliruxufozug.pdfIn PDF document text
    • https://fogofude.weebly.com/uploads/1/3/4/3/134322730/rubaromajos.pdfIn PDF document text
    • https://tubanepa.weebly.com/uploads/1/3/2/7/132740320/monatatazom.pdfIn PDF document text
    • http://bitasifo.22web.org/can_u_use_in_formal_writing.pdfIn PDF document text
    • https://doxediseweroz.weebly.com/uploads/1/3/4/6/134634010/4466829.pdfIn PDF document text
    • https://wudajelenap.weebly.com/uploads/1/3/4/4/134470879/9416781.pdfIn PDF document text
    • http://votixowet.22web.org/xobodotatevokugilejeze.pdfIn PDF document text
    • https://jugifipunud.weebly.com/uploads/1/3/1/4/131437595/5755299.pdfIn PDF document text
    • https://nuzixusimupe.weebly.com/uploads/1/3/4/3/134306281/7575a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tepuxasimu.rf.gd/internet_manager_registration_serial_number.pdfIn PDF document text
    • http://wemosoxa.rf.gd/libros_de_armando_hoyos.pdfIn PDF document text
    • http://bipedok.epizy.com/fisavoz.pdfIn PDF document text
    • http://mevukesamuzu.rf.gd/purble_place_online.pdfIn PDF document text
    • http://tuvakaj.epizy.com/83799642985.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31D 5364 bytes
SHA-256: 2bb82c037d57a82f6a7e76c98c329e1c246db757cbeebaa736d212d7dd56d2e9
font_01_sfnt_off0000e57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57A 10672 bytes
SHA-256: 7e8a72641cc6e0bbb927f2728f8a92f021dd0b3b0505a11e90db6d4a6caacfb9
font_02_sfnt_off000109de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DE 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

Open this report in the interactive analyzer, or submit your own file for analysis.