Malicious PDF — malware analysis report

Static analysis result for SHA-256 958fbcd93a302e81…

MALICIOUS

PDF

81.3 KB Created: 2021-04-01 15:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 27c5f121d62b119956c635fa7a1a36e3 SHA-1: b2af9454cdf2b17fb30c6d363fdb905bfabd3ec8 SHA-256: 958fbcd93a302e819e90660e9b346e5724520a927ef9279fe2106cc4d1e96cce
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to redirectors and SEO farms, indicating a phishing or malicious content distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of external links and the overall structure point towards a lure to a malicious website.

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://seumenha.ru/strik?utm_term=how+to+turn+on+pilot+light+on+boiler PDF link annotation
    • https://cdn.sqhk.co/rudolikube/aIidies/rukeluzesasodawav.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/idjgykE/react_native_todo_list_firebase.pdfIn PDF document text
    • https://dimejozetef.weebly.com/uploads/1/3/1/0/131070151/9244805.pdfIn PDF document text
    • https://cdn.sqhk.co/vivepovugeli/5uO0tqA/hungry_shark_heroes_hack_download.pdfIn PDF document text
    • https://fodukajanewirom.weebly.com/uploads/1/3/5/3/135383911/gufuz-rufepakulimat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/68e4f97d-aaf0-4840-8248-af0adba6bfe6/star_trek_enterprise_books_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bfd2876-75b4-44c9-81b4-3fd092d602bd/kibazenudukejofetige.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/cognos_tutorial_report_studio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2379a486-f507-4d6f-b3f5-37c4bbb097a8/confessions_of_an_advertising_man_david_ogilvy.pdfIn PDF document text
    • http://bujijawuta.atwebpages.com/murikepe.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/kuxagafuguli.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/60599249178.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/vlookup_to_input_data_from_another_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/81274886553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ec63824-5a6e-432b-a526-8a46aa22796e/are_oreck_air_purifiers_safe.pdfIn PDF document text
    • http://pijosufun.myartsonline.com/imam_bukhari_biography.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dd3d111-2eda-48d3-a351-c1caa6b29b25/how_to_add_music_to_ipod_nano_5th_generation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4443d2f5-be83-40e8-b0bf-8704d55dc8f5/80958486278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5abec053-ba39-44f2-8906-33a1a2b34dcb/sotesi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 4768 bytes
SHA-256: e7f588e597c9fe30acfe820c3df0d379c40b6cc3fc48a4a2856db39d18680f26
font_01_sfnt_off000103fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FA 11192 bytes
SHA-256: aaf9e078b9ede69f9307b1fadfa93630fe81632e5393c28119abcc91e6742b1d
font_02_sfnt_off00012a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A18 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f