Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f529160a96caa06…

MALICIOUS

PDF

80.8 KB Created: 2021-02-23 17:03:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cfc055f72a77bc1a80ebbb6292625bb4 SHA-1: 5d7778a397279fd25142b1e839baf491eca88e1b SHA-256: 0f529160a96caa063d1762ef68504232f45f73e2f2a543938356445e63519bfb
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a prominent one leading to 'jottigo.ru', identified as a redirector for SEO-based phishing. The document body, though heavily obfuscated, suggests a lure related to an English grammar book. The presence of a large number of external links and the ML classifier's high confidence score indicate a malicious intent to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=basic+english+grammar+book+3.pdf+-+mark%2527s+esl+world PDF link annotation
    • https://nagagixibedixu.weebly.com/uploads/1/3/1/6/131606435/5990980.pdfIn PDF document text
    • https://jutamuxenaritul.weebly.com/uploads/1/3/1/4/131452982/solugivixevade.pdfIn PDF document text
    • http://bavunexebiri.iblogger.org/jirosumamikos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/votetogiwaxisetes.pdfIn PDF document text
    • http://xanatilaguweve.epizy.com/kapiwusupunixifuwiw.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/88750417493.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/3997101727.pdfIn PDF document text
    • http://tugojolowok.epizy.com/54074857524.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/65533657314.pdfIn PDF document text
    • http://kalesas.rf.gd/21765498906.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/permutations_and_combinations_aptitude_questions_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/kofaliwipamalumasete.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/bed_sheets_buy_online_usa.pdfIn PDF document text
    • http://divapikej.rf.gd/1342319667.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/bekowuzusupimuf.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/50227270110.pdfIn PDF document text
    • http://sozidimimu.rf.gd/budget_2019-_20_date_pakistan.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_off0000fd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD21 6176 bytes
SHA-256: d1b1e793db776e81c9fa73c6b6ce43c78c43d30a3fdc552f9efc7dd63af5526e
font_01_sfnt_off00011215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11215 10960 bytes
SHA-256: 489b51535db33483b7695f58f311927ae171f4ecd955b190859ff10c445f2d8f

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