Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f824db06d2490f…

MALICIOUS

PDF

72.0 KB Created: 2021-01-22 08:16:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: 061ed3dcc5a264a9149163e485e2dae9 SHA-1: ee9927e532751cf1c29426d22968f84bef782a43 SHA-256: a3f824db06d2490fd7495b110714ee0a4019465ca271775c559a403798fdca44
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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.
  • 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/123?utm_term=google+sites+intranet+templates In PDF document text
    • https://tifimiwarefimi.weebly.com/uploads/1/3/4/8/134895051/juxomun-vefavatazo-mewewudep.pdfIn PDF document text
    • https://mumerigowijegap.weebly.com/uploads/1/3/4/7/134771458/malawebimanu.pdfIn PDF document text
    • https://muwivagejexe.weebly.com/uploads/1/3/1/3/131379070/kifufonagokirezox.pdfIn PDF document text
    • https://wadasowodasi.weebly.com/uploads/1/3/5/3/135316150/8140230.pdfIn PDF document text
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/8390481.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/watajive/80882660380.pdfIn PDF document text
    • http://kutijizon.epizy.com/anaconda_2._7_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/30025350763.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/top_10_south_indian_movies_websites.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/insect_glaive_guide_monster_hunter_world.pdfIn PDF document text
    • http://nadefivetokilak.rf.gd/menu_planning_guidelines_for_long_day_care.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/dslr_camera_ke_photo.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/apply_for_road_tax_form.pdfIn PDF document text
    • http://kupavojos.epizy.com/aoe_rise_of_rome_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/kutitujobivobesawo.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_off0000dcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF7 5168 bytes
SHA-256: 0e92d8034dfae1cc1c145085eca0736195175bec97628ce866b994c49b8c83a3
font_01_sfnt_off0000ee7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7D 10804 bytes
SHA-256: 465210dbbe35dd8fa87b1672e26f0132c6645a5898f0f475887db3904df76299

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