Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd48aa7a317f151f…

MALICIOUS

PDF

71.5 KB Created: 2021-04-04 23:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 631625acce1ee363f5dd479dbf248844 SHA-1: df5324952694696a3bdd4ed8eaf30fab6690571a SHA-256: cd48aa7a317f151fa728ca30f3f4595aa259adeeb222b69b10db28fe2dc5d0f5
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristic indicates the document is designed to lure users via an image to a redirector URL, which is likely intended for phishing or malware delivery. The embedded URL 'https://nipisod.ru/wix?keyword=second+and+sebring+live' is the primary IOC for this attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/wix?keyword=second+and+sebring+live PDF link annotation
    • https://riganekonima.weebly.com/uploads/1/3/0/8/130874133/somufokop.pdfIn PDF document text
    • https://mekupefaju.weebly.com/uploads/1/3/5/3/135316310/tefogubegolobu-xabumiwar-moxisusixezadi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393033/normal_604857fe7d7d5.pdfIn PDF document text
    • https://subijiderekura.weebly.com/uploads/1/3/4/6/134616270/runuzumoxilu.pdfIn PDF document text
    • http://flowerport.store/83987740088vyvin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479212/normal_60244a30323bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454425/normal_5fcb7a8c348d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447079/normal_5ff4b06347d59.pdfIn PDF document text
    • http://gasufulezexe.22web.org/django_humanize_template.pdfIn PDF document text
    • http://edapog.online/adobe_reader_for_apple_ipadyuxhz.pdfIn PDF document text
    • http://domsale.xyz/restaurant_inspection_checklist_templatex8jpc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483335/normal_5fe8f42887754.pdfIn PDF document text
    • http://shopyou.online/sizimg8jxn.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/abb58130-2a96-4854-853e-fc7a6fb87ddf/calendario_sep_2019_y_2020_cdmx.pdfIn PDF document text
    • http://limazajot.rf.gd/98716004323.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/nuwedupexezineromi.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/xepex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e6b5a30-1764-491e-97a1-8fd377f7b777/11919744888.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/astmh_2019_abstract_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/cbse_net_july_2018_admit_card.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/folopedotijori.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_off0000da89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA89 5408 bytes
SHA-256: cad01122aeafacec0e3616227721d35a051b7b7e1d78183a82bf450243ed8a4f
font_01_sfnt_off0000ecfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFB 10440 bytes
SHA-256: 7de394695248b5aff591d6419c215467df8b783710b4466ff7fa8b3daa8491a5

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