Malicious PDF — malware analysis report

Static analysis result for SHA-256 a719de3611ac8ddb…

MALICIOUS

PDF

75.4 KB Created: 2021-02-20 11:05:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 89a41cfb6162561101eed5424ac2112b SHA-1: 1953cfafb4d369dc84cb2101553d583f2e933f76 SHA-256: a719de3611ac8ddb8ff177e8b6db0c32067c964ac43d8cc4d04ed34879e96c13
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be related to search engine optimization and software manuals, likely serving as a lure to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/wix?keyword=sketchup+2017+user+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/zodunoxurob/ieNgckB/rorabuxiva.pdfIn PDF document text
    • https://jajesawi.weebly.com/uploads/1/3/0/8/130813829/suxaxikabup-pofojopijaduzow-komuwasuda.pdfIn PDF document text
    • https://cdn.sqhk.co/jawuraxexije/id7qgcE/messenger_download_for_android_4._4._4.pdfIn PDF document text
    • http://agent-spv.space/motu_patlu_cartoon_video_song_2020o24ex.pdfIn PDF document text
    • http://stylecurtains.com/free_compass_app_for_iphoneopdcb.pdfIn PDF document text
    • http://50offstore.info/facial_nerve_ppt_freepqmu2.pdfIn PDF document text
    • http://dressnbuy.com/la_divina_comedia_de_dante_alighieri_el_infierno2gie8.pdfIn PDF document text
    • http://1green.space/voxikina9dea4.pdfIn PDF document text
    • http://sendgrid-de.com/75485732407rqm6e.pdfIn PDF document text
    • http://jarizodej.22web.org/95257231486.pdfIn PDF document text
    • http://cardio-natural.info/html_link_to_page_not_working3l9wo.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/egijfia/special_agent_dale_cooper_cat.pdfIn PDF document text
    • https://cdn.sqhk.co/dewavasese/gcigibz/80234284481.pdfIn PDF document text
    • https://kazirevuteguzug.weebly.com/uploads/1/3/2/6/132681824/bozalapetazidem.pdfIn PDF document text
    • https://cdn.sqhk.co/kagofiwavum/hjjzjiJ/7758973374.pdfIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE824 5968 bytes
SHA-256: 68dc6333b33456a9270a9dd9be2b39b407969518166d353d02b3c19d61431aa6
font_01_sfnt_off0000fc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5F 10660 bytes
SHA-256: b0c8f91f621f15a312c3e99fb60e3ac28771cafad800dca8f36ef00ed390843e

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