Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24b130e201267ad…

MALICIOUS

PDF

74.0 KB Created: 2021-03-29 06:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 15dd4c0365e53e078f5f49f248d8ff97 SHA-1: 2232b611b18581329b096216ac8bc5c5c92d7e60 SHA-256: f24b130e201267ad2d99837856913f55918dcbacfc102bc7864323b8b2bef5fe
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning and phishing. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, and 'PDF_SEO_UTM_REDIRECTOR_LINK' points to a redirector URL. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/wix?keyword=unit+3+worksheet+1 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446489/normal_600341f425a21.pdfIn PDF document text
    • https://lanekugufer.weebly.com/uploads/1/3/5/3/135351315/jadeni_xewafoxibomi_wisawodajevu_tagemamawamuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527747/normal_6019f65824f95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501204/normal_605c9a6dd4f67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385231/normal_5ffdee2cb9090.pdfIn PDF document text
    • https://tuxazapewim.weebly.com/uploads/1/3/4/8/134846749/9c638ab.pdfIn PDF document text
    • http://jekebes.iblogger.org/sample_essay_about_yourself.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480728/normal_604705d234075.pdfIn PDF document text
    • https://xigeworimejol.weebly.com/uploads/1/3/1/4/131483719/rubixirope.pdfIn PDF document text
    • https://tukadivi.weebly.com/uploads/1/3/2/6/132695248/gugosav.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/bufipevuril/free_handwriting_practice_sheets_nz.pdfIn PDF document text
    • http://pabugevekuxib.rf.gd/charles_bukowski_donne_libro.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/wetopifijomujam.pdfIn PDF document text
    • http://mogorir.epizy.com/livizumuso.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/vocabulary_list_environment.pdfIn PDF document text
    • http://sivojosifa.epizy.com/what_is_splitting_personality_disorder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/379cb29a-299d-46ef-817b-7db109e000ed/the_ancient_magus_bride_chise_x_elias_lemon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8e32aa6-0da8-4702-bb3b-59827c6cae9f/how_big_is_daggerfall_compared_to_skyrim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95272794-76d2-4cf4-b4c4-056f186be951/japodubodireguza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46d326e8-7970-4055-8ac7-e75ad4bddfb6/canon_powershot_sx20_is_price_in_pakistan.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/acknowledgement_for_a_business_report.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/47277374380.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03B 4892 bytes
SHA-256: 4044de6b41f29f141aaebfa77ee5344c09c2e7c4fb06bc418dd1685026956fad
font_01_sfnt_off0000e0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FF 10448 bytes
SHA-256: f2cde5bc5738733870ac750faec3fd0eb920bc41176186ae74a4fd3002ba5027
font_02_sfnt_off00010521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10521 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15