Malicious PDF — malware analysis report

Static analysis result for SHA-256 baef875f4e9011d3…

MALICIOUS

PDF

74.5 KB Created: 2021-06-04 00:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85a4e6ce6a74dd53c830c50c1b73b14a SHA-1: d450b6b8e3a3a4a39baa1ed7ff285d6c92114c29 SHA-256: baef875f4e9011d3c0c98b3ff2334f173dbb83ab56b6fa4edf294a42a8a8619b
196 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external PDF links, and 'SE_PASSWORD_ARCHIVE_LURE' suggests the document is designed to trick users into downloading a password-protected archive. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cructi.ru/pbw?utm_term=guia+dinamica+de+ingreso+a+secundaria+2019+pdf
    • https://sedaduvu.weebly.com/uploads/1/3/4/5/134598683/6487990.pdf
    • https://fuwemuwiwogul.weebly.com/uploads/1/3/4/0/134016804/fumin.pdf
    • https://kijaxupujik.weebly.com/uploads/1/3/2/6/132695195/rofakikew.pdf
    • https://zezazerin.weebly.com/uploads/1/3/1/8/131856191/5962798.pdf
    • https://cdn-cms.f-static.net/uploads/4422897/normal_60b8b56e1ebd7.pdf
    • https://zixixowiw.weebly.com/uploads/1/3/4/6/134605173/bubetu.pdf
    • https://sovewepipofev.weebly.com/uploads/1/3/4/8/134846449/nuduk_budazup.pdf
    • https://tagalevef.weebly.com/uploads/1/3/0/8/130815582/6141840.pdf
    • https://pirulavedup.weebly.com/uploads/1/3/1/3/131379447/4590433.pdf
    • https://gakulenem.weebly.com/uploads/1/3/1/4/131437742/1089312.pdf
    • https://nagaleburanab.weebly.com/uploads/1/3/4/3/134379557/nedapitubuw.pdf
    • https://dukozajaxal.weebly.com/uploads/1/3/4/0/134017298/lejolujenatulon.pdf
    • https://cdn-cms.f-static.net/uploads/4471484/normal_60357737eb232.pdf
    • https://revasarubon.weebly.com/uploads/1/3/5/2/135295272/tatojefugok.pdf
    • https://ragenakesigufu.weebly.com/uploads/1/3/2/7/132740294/dalakelego-guvabe.pdf
    • https://gubuwogufulero.weebly.com/uploads/1/3/4/6/134608521/ee6791.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://laxaxufudej.pbworks.com/w/file/fetch/144526503/pobuxilosavajozolubidonu.pdf
    • http://zigunef.pbworks.com/f/pak_study_book_in_urdu_10th_class_free_download.pdf
    • http://kafunujazuwo.pbworks.com/w/file/fetch/144525846/scorpions_wind_of_change_mp3_download_musicpleer.pdf
    • http://fuxedemama.pbworks.com/f/72307724167.pdf
    • http://zipiwume.pbworks.com/f/49069223518.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d427.bin
f422f7577604529c6f7aa08e8842d942547751e60f446d5c4602a19cfee08226
pdf-font-stream PDF embedded font (sfnt) at offset 0xD427 5756 bytes
font_01_sfnt_off0000e7a3.bin
cd25865e867af14ce7cd54ef44c69003f56e0a586e0a90c91b86215b49ac368e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A3 11024 bytes
font_02_sfnt_off00010bd8.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD8 4324 bytes