Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b708f4a13398cf…

MALICIOUS

PDF

76.7 KB Created: 2021-04-06 16:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9c84d194c40ea296949b540b1b163a74 SHA-1: 20e322093fec1d26f44bf295d820ed74b33fa358 SHA-256: c7b708f4a13398cf15505c3439d9f38ea00fb6e864aa9ba215035df405f2ee1e
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many of which are part of an SEO link farm designed to redirect users to potentially malicious sites, such as 'https://dugedepap.ru/wix?keyword=activities+and+societies+resume'. The document body, though heavily obfuscated, suggests a lure related to resumes. The presence of PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dugedepap.ru/wix?keyword=activities+and+societies+resume PDF link annotation
    • https://suxaposalepet.weebly.com/uploads/1/3/4/6/134677753/9342923.pdfIn PDF document text
    • https://matimupu.weebly.com/uploads/1/3/4/8/134880469/paminalok.pdfIn PDF document text
    • https://zazalefofano.weebly.com/uploads/1/3/4/5/134578352/c732a26586.pdfIn PDF document text
    • https://werijumifisa.weebly.com/uploads/1/3/4/7/134729585/3502080.pdfIn PDF document text
    • https://ladunibik.weebly.com/uploads/1/3/4/0/134096621/4758911.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/35d88dbf-ca0d-4259-9e4b-a6527713eeab/wugedumaxikilofokefoku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b58eef0-ff44-4f3d-a8a3-524d56492f2e/toro_snow_thrower_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/when_you_wish_upon_a_star_sheet_music_violin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f563c90d-aebc-40f4-a3ae-39323a582aaf/walt_whitman_poem_death_of_abraham_lincoln.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/lokerij.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/bolens_spare_parts_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4e8286f-e4c2-4c3b-a3b5-ed8f6881a3f1/how_to_adjust_time_casio_illuminator.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/nagowaxikuxewisumus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/373a984a-2d0a-4f32-9d8d-e51c1507d955/fe_exam_reference_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/voraxabuwefekajudegu.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/aha_bls_test_answers_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/metevuv.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/hae_min_lee_height.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/how_to_connect_yamaha_yas_107_to_tv.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_off0000ee85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE85 5100 bytes
SHA-256: de882f73e18ce6852cc31e65307489f4e554a0be3601043c79338c19a822ca56
font_01_sfnt_off0000ffd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD3 10644 bytes
SHA-256: f9f4308e13287736ac29365c143d5817d766d5f9eddc47aaccbf75afeba8c9ec