Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e100ad8e2e60a1…

MALICIOUS

PDF

70.8 KB Created: 2021-02-06 21:01:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 701381e62f31a82fbde8ee13f7a4f10b SHA-1: 266bcd5903021de7e7e8bc02dce717c02f0f56bc SHA-256: a0e100ad8e2e60a1655940003697821ed235e0e7a7d300e32b4dfdbc79670579
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with one specifically pointing to 'jottigo.ru' and another to a 'sqhk.co' domain, indicative of a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to 'Universidad autonoma de guadalajara costo', likely a lure to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=universidad+aut%25C3%25B3noma+de+guadalajara+costo PDF link annotation
    • https://cdn.sqhk.co/silutoge/hhcqhag/zakenudojewi.pdfIn PDF document text
    • https://lumejukotexute.weebly.com/uploads/1/3/1/1/131163930/8235987.pdfIn PDF document text
    • https://luzuredero.weebly.com/uploads/1/3/4/0/134016924/xabimiv_ropawu_mivelu_torokosuwotaju.pdfIn PDF document text
    • https://tesegedoveveda.weebly.com/uploads/1/3/4/8/134891870/8178649.pdfIn PDF document text
    • http://mamimufexaliro.66ghz.com/get_bytes_from_bitmap_android.pdfIn PDF document text
    • https://cdn.sqhk.co/selusujava/ajjq7jh/jejibimawadapotux.pdfIn PDF document text
    • http://fenellalucynelle.info/41810550916l7yft.pdfIn PDF document text
    • http://vashastrahovka24.ru/acoustics_booksud46.pdfIn PDF document text
    • https://cdn.sqhk.co/voguzasijur/ifhgjdV/pusujekomujo.pdfIn PDF document text
    • http://vofefipegurixu.iblogger.org/11089709006.pdfIn PDF document text
    • https://jolibudowuw.weebly.com/uploads/1/3/4/5/134596284/87860.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bumerezuwo.epizy.com/desarrollo_evolutivo_del_cerebro_humano.pdfIn PDF document text
    • http://xifabopopotesa.epizy.com/janapada_songs_please.pdfIn PDF document text
    • http://nuxizutize.rf.gd/75079098303.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_off0000d3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B2 5520 bytes
SHA-256: fa51f5cea816f70eb68042a8674552408d4676b65daaadf4fd71f94d0886b94e
font_01_sfnt_off0000e632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE632 12048 bytes
SHA-256: 30b1f71c88bad5cd3df1791c76ccff4103d0fa6d7187c7c51c3bd0c55fc5356c

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