Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b77ae9cd87c8f3a…

MALICIOUS

PDF

73.3 KB Created: 2021-03-26 18:41:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 66c3b84d71a84ccfb46e4ef6647431ae SHA-1: b5c18c7b392c5e7ecf96d271fcef2ba6c6694d19 SHA-256: 0b77ae9cd87c8f3a8282c5501444fb834f6c0c158d87ea367b15b3472971dc67
194 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it links to malicious redirector infrastructure, specifically identified as a phishing lure. The embedded URL `https://yafferge.ru/award?keyword=antonyms+worksheet+with+answers+pdf` is flagged as malicious. While no scripts were explicitly extracted, the PDF structure and malicious link suggest an attempt to redirect the user to a site for phishing or malware distribution, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=antonyms+worksheet+with+answers+pdf In PDF document text
    • http://meduduwaje.22web.org/benjamin_franklin_autobiography_part_2.pdfIn PDF document text
    • http://naturfresh.fun/how_long_is_navy_basic_training_at_great_lakes1gd3w.pdfIn PDF document text
    • http://just-gopro.com/entombed_left_hand_path_album_lyricsb6bcc.pdfIn PDF document text
    • http://autobaff.xyz/can_wing_chun_be_self_taughtdxsjr.pdfIn PDF document text
    • http://store50off.info/antecedentes_historicos_de_la_diabetesga7eh.pdfIn PDF document text
    • http://lalozakuren.66ghz.com/gogexafejegolifepopi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_10188a02650a487ea06bb8c7bdd41a83.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pujirageg/ziratomikimogifuzodu.pdfIn PDF document text
    • https://e8ceee85-86bf-4804-80ab-d7a1511cbcf5.filesusr.com/ugd/38650a_bc62905087454d0082291e1d20e61a47.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/falejogajir/three_skeleton_key_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/spoken_english_app_free_for_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/mimepiv.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/tijuxexeruneriwagi.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/jijojolek.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/mozeririmezolutejowuvaj.pdfIn PDF document text
    • http://durezalur.epizy.com/acta_constitutiva_empresa.pdfIn PDF document text
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_0f139952611945038cfbfefe2ca27ca7.pdf?index=trueIn 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_off0000e062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE062 5496 bytes
SHA-256: 974deeb2a750f88dbb1d5f69a96021cea0c801272cbc60650617c3862e204535
font_01_sfnt_off0000f307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF307 11032 bytes
SHA-256: bac3cf60bccba0925caedb5d2f8f334a8eeabc66e6734b2e416d9a63ebce26b4

Open this report in the interactive analyzer, or submit your own file for analysis.