Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ec253992bcefb24…

MALICIOUS

PDF

72.8 KB Created: 2021-04-07 17:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56b17dd84ab0198c40ba8f7fb60a65e1 SHA-1: 765329f99c2e5567ba1d4d2290c388fc9d671a6f SHA-256: 1ec253992bcefb2447f35b5e5ea7157b5422311c446fc889b8729ad43473340d
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are dynamically generated and appear to be part of a link farm designed to improve search engine rankings. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a malicious intent to direct users to potentially harmful websites. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards a malicious document, likely intended for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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/award?keyword=mobile+money+pdf
    • http://imedo.ru/kuruvotuxavzwvx.pdf
    • https://veralekixa.weebly.com/uploads/1/3/1/0/131069874/a4e27.pdf
    • http://50offit.pro/campaign_finance_reform_definitionggwvo.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • http://natorg.fun/31984923084lkiu.pdf
    • https://nojijakifon.weebly.com/uploads/1/3/4/0/134012839/afed8434312.pdf
    • http://sale20.site/bharat_gas_app_freel0a6a.pdf
    • https://volejodanuba.weebly.com/uploads/1/3/4/5/134593723/2193656.pdf
    • http://freud.icu/84090503212e3c4q.pdf
    • https://sifizebutu.weebly.com/uploads/1/3/0/8/130814914/kedagal.pdf
    • http://epaytds.xyz/zuzuvamadiduguvexaovhfg.pdf
    • https://wixokaregojes.weebly.com/uploads/1/3/2/6/132681478/fazipivuwanedu_lafedaxojizo_jakotado_ritebowaxaperiw.pdf
    • https://lolorude.weebly.com/uploads/1/3/0/7/130775760/ceb189146.pdf
    • http://gramnews.xyz/astro-_vision_lifesign_horoscope_software_freec5ss4.pdf
    • https://nodokesomizi.weebly.com/uploads/1/3/4/6/134656280/4408557.pdf
    • https://gaxowaxogofesix.weebly.com/uploads/1/3/4/7/134719425/6678302.pdf
    • http://zootime.store/874593867981n4en.pdf
    • https://zuvofuguwapu.weebly.com/uploads/1/3/4/0/134042474/ziwapazupaxi.pdf
    • http://securespot.ru/satafijutomomiwaymhdx.pdf
    • http://eurozone.pro/rutoxlo3ya.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e201.bin
28c56c3286cb9f54ec8ca66255d6fa7d49d315e362d5464355a51c5de8ff44c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE201 4948 bytes
font_01_sfnt_off0000f2db.bin
4550b67fceec6c75e7a382244034963c57700eb012dc284bd90d1bd85cb286de
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DB 10352 bytes