Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e08c17cbc9b975…

MALICIOUS

PDF

79.2 KB Created: 2021-02-21 09:43:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 7d4d335637da85ef1b09a6d23b430c26 SHA-1: 94c9398610f45262a8831d849c28d84f2f597b05 SHA-256: 87e08c17cbc9b975b236396da823ca79563ca6d1f4e6055311dd1cec9f14abfa
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://jottigo.ru/strik?utm_term=craftmaster+water+heater+element+replacement PDF link annotation
    • https://cdn.sqhk.co/mujexoxa/1Ogetq3/cube_escape_paradox_walkthrough.pdfIn PDF document text
    • http://cleaner360.shop/flotec_pump_parts_home_depot50gar.pdfIn PDF document text
    • http://pemutoguxo.66ghz.com/66223510876.pdfIn PDF document text
    • http://prosale.company/hayvan_iftlii_indirxdkjg.pdfIn PDF document text
    • http://legrand-spb.ru/synonym_worksheet_for_3rd_graders825c4.pdfIn PDF document text
    • https://jetisinodab.weebly.com/uploads/1/3/5/3/135335938/padej-jajeridijuza-wapugeda.pdfIn PDF document text
    • http://prizinsta24.space/hotstar_app_update_versionk1q4w.pdfIn PDF document text
    • http://webcam-model.online/85704657074hqaht.pdfIn PDF document text
    • https://nutovavodus.weebly.com/uploads/1/3/4/0/134012609/1d259.pdfIn PDF document text
    • https://kakejomoweva.weebly.com/uploads/1/3/4/6/134674311/radativop.pdfIn PDF document text
    • http://fartook.online/ekrem_yekrek_gnlk_planjlqwi.pdfIn PDF document text
    • http://prizinsta24.online/60273755080vkxp6.pdfIn PDF document text
    • https://bisojobiregabo.weebly.com/uploads/1/3/4/5/134509607/549f6c9a24cb.pdfIn PDF document text
    • https://putesoborufo.weebly.com/uploads/1/3/0/8/130814126/5377909.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000ea97.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEA97 10980 bytes
SHA-256: f2bb37e85f7cfcf0fdde53a6f071e18bda23a2c47dcc7839abb81e6a45b5bb30
font_00_sfnt_off0000d8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DF 5252 bytes
SHA-256: 44f03763aabf16e67a4b8f86e54012c957ea136ed30d6effbce60498bc949d4c
font_02_sfnt_off00010999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10999 11144 bytes
SHA-256: dc21b0457f235533fa47e916aa4c4823ba94e9985f3655d42ad0a7b0e60f0609

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