Malicious PDF — malware analysis report

Static analysis result for SHA-256 b183ca75b87e833e…

MALICIOUS

PDF

81.2 KB Created: 2021-03-24 20:51:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e0d356da4f1f0256a0d92655955156f7 SHA-1: 263da6a74b07a74b83f7786cd66dfd3133e43c95 SHA-256: b183ca75b87e833ea6bea5617ef7be3c701c7b7aafe177b2968ef9abb9b3e531
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation scheme. The presence of embedded URLs and the overall structure point towards a phishing or malicious content delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://maypoin.ru/123?utm_term=familia+hemiptera+pdf PDF link annotation
    • https://bujakisuka.weebly.com/uploads/1/3/2/6/132695398/mifagadeva.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/2014_kubota_bx25dlb_specso2jxw.pdfIn PDF document text
    • http://vinograd.io/91973034460foa1u.pdfIn PDF document text
    • https://talunijepi.weebly.com/uploads/1/3/4/5/134599753/losinafax_zirojosanaxe_genewomero.pdfIn PDF document text
    • http://pavezala.iblogger.org/eosinophilic_pneumonia_treatment_guideline.pdfIn PDF document text
    • http://blockingscenery.com/xuxowiserobexupibatmxl81.pdfIn PDF document text
    • https://molujeridinu.weebly.com/uploads/1/3/4/4/134400438/gimexoviwes.pdfIn PDF document text
    • http://bnatural.space/messenger_lite_new_versionh7ylo.pdfIn PDF document text
    • http://repair-telefonov.ru/cosmology_of_monsters_endingju6y4.pdfIn PDF document text
    • https://faxipanonuk.weebly.com/uploads/1/3/4/3/134352952/fubidis.pdfIn PDF document text
    • https://xolesozetenosox.weebly.com/uploads/1/3/1/0/131070434/1652984.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://supetarezof.epizy.com/pudomezexafozogujiwetow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86d8ff62-7a44-4638-ac86-1e48b8216372/dell_24_ultra_hd_4k_monitor_p2415q_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cbbf5f7-35ba-4154-94ed-e67ae6f6af09/ritomusodekitufekej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab4d8f25-131a-41b4-b0e5-b0ab4847ecee/16650581405.pdfIn PDF document text
    • http://limekukojaso.epizy.com/android_studio_apk_version_code.pdfIn PDF document text
    • http://tisenunab.rf.gd/amos_tversky_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a82a4bee-a2ee-42c2-8cd1-2eb015dc1be6/42137301273.pdfIn PDF document text
    • http://gipunofagewux.epizy.com/ccna_2_chapter_1_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5788e101-8d07-4443-a1b4-bd20a0d083a7/91671970688.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/noxila.pdfIn PDF document text
    • http://simipibenafar.epizy.com/neumonia_bacteriana_en_nios.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/rewus.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_off0000ebe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE6 4632 bytes
SHA-256: 2a0f22bb80bb982d27d49a8faeaa60dd5eedab81f5c2473901bcf4506e58dbb9
font_01_sfnt_off0000fb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB94 13600 bytes
SHA-256: dde1cd8900e8d9055612ad783bcca71789b3a9cc06226c36837c0f63c0a6aed5
font_02_sfnt_off00012778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12778 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c