Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af592a100592a43…

MALICIOUS

PDF

85.5 KB Created: 2021-03-09 21:17:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c81472bbdbc0efa9415ce7d4b44025d2 SHA-1: 5829c31880584695939fc9b9442099da34a26a0e SHA-256: 0af592a100592a433f5b60fa1b15d9f974aea50c6df742c026d74322585558dd
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDFs, suggesting a link farm or SEO abuse tactic. The primary lure URL, 'https://seumenha.ru/award?keyword=econometrics+by+example+solutions+pdf', is designed to trick users into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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/award?keyword=econometrics+by+example+solutions+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452835/normal_5fd19b2443c36.pdfIn PDF document text
    • http://vuwadezizubem.22web.org/software_alcohol_120_free.pdfIn PDF document text
    • http://mufezupep.iblogger.org/is_there_a_sketch_app_for_ipad.pdfIn PDF document text
    • http://jelexak.iblogger.org/38103328769.pdfIn PDF document text
    • http://natenezen.22web.org/ruxevu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370778/normal_5fdb2769c527e.pdfIn PDF document text
    • http://mivigodaxi.iblogger.org/microsoft_visual_basic_2010_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412413/normal_603746f768fad.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/lupuvogotog/gisekisofef.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/xuvipozuzenolonepubu.pdfIn PDF document text
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_a993cf46b214411a971b861f80d8621f.pdf?index=trueIn PDF document text
    • http://nuzavaxevarap.epizy.com/62505063967.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/wofasisunakaxewofebuvul.pdfIn PDF document text
    • http://rugeritubaduw.epizy.com/vande_mataram_tamil_hd_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/engagement_ring_guide_for_guys.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/zone_leveling_guide_vanilla_wow.pdfIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_7b734e85b40a4fcb9a04b3b44ee3defb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/chemical_reviews_proposal_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/what_is_the_best_cordless_phone_with_call_blocking.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/simitasizulawebadoti.pdfIn PDF document text
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_f0b375c50858426285d89c90212ff4d6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/search_text_linux.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000fca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA1 6744 bytes
SHA-256: 0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63
font_01_sfnt_off00010d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D88 5568 bytes
SHA-256: 5dd9e0dd2a09e3ae8cde416441ae4303cdf3d2db504c7e086c79942e2e66e879
font_02_sfnt_off0001206d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206D 11108 bytes
SHA-256: 8335d0dcaf8e0883f69228e9a6341bebd33ab64c1a0f3a0e6d4ce89ae7e90788