Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b7b6408cb92c9b…

MALICIOUS

PDF

76.2 KB Created: 2021-02-27 06:08:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e5cf2d69889ec7f7062d9a51786dcd22 SHA-1: 532227a9c1a090db223b315b0a09ed2a483aa846 SHA-256: 08b7b6408cb92c9b3116caf214d49cee4f1ed8221c0998a9bae507f7c9d72fff
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. The document body, though truncated, suggests a lure related to academic answers. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://nipisod.ru/wix?keyword=common+ion+effect+on+solubility+pogil+answers PDF link annotation
    • http://wapividazofar.scienceontheweb.net/44761782257.pdfIn PDF document text
    • https://vawilateg.weebly.com/uploads/1/3/4/6/134697686/26e42a1f.pdfIn PDF document text
    • https://takupomowemeb.weebly.com/uploads/1/3/5/3/135314116/972293a2c52.pdfIn PDF document text
    • https://merugerizun.weebly.com/uploads/1/3/4/3/134337850/kezasa-wadapu.pdfIn PDF document text
    • http://rivozuzeno.mywebcommunity.org/kekaxipawakej.pdfIn PDF document text
    • https://nimuneroz.weebly.com/uploads/1/3/1/4/131407882/745898.pdfIn PDF document text
    • https://xuxijoma.weebly.com/uploads/1/3/3/9/133997678/bevelutavujorotob.pdfIn PDF document text
    • https://cdn.sqhk.co/norumuwapa/biggeif/lomomerilawenorusavozu.pdfIn PDF document text
    • https://judavolegarar.weebly.com/uploads/1/3/1/8/131871921/4504488.pdfIn PDF document text
    • https://dolunejasuvufa.weebly.com/uploads/1/3/0/7/130776008/9747228.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/bnV5ihH/.pdfIn PDF document text
    • https://gidapozu.weebly.com/uploads/1/3/1/3/131379371/1962588.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nodikisiti.rf.gd/74769630409.pdfIn PDF document text
    • http://zoponoz.epizy.com/30498642841.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/luzizogilaxop.pdfIn PDF document text
    • http://jabelakejirer.epizy.com/traktor_s4_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/microsoft_sql_server_2014_express_sp2.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B0 5572 bytes
SHA-256: 69c3c310780898de7d1fc244382376176620ca0c4479dd431c60120679217f9c
font_01_sfnt_off0000fcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAB 12020 bytes
SHA-256: df338d5bcd420cabfde2925301a38885d2191e7759f095a34eb279df95ede985

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