Malicious PDF — malware analysis report

Static analysis result for SHA-256 df90a7915d3f01a9…

MALICIOUS

PDF

72.7 KB Created: 2021-03-01 00:53:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 3f6b6987cfd6f375a9e864821df5d301 SHA-1: c0951d4758995b8a8a3dbb871f750b0babde1de3 SHA-256: df90a7915d3f01a9bc21773394260e39cbe252694cd22f76efd237f6da825700
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://dafemum.ru/aws?utm_term=what+is+retrieval+cues+in+psychology In PDF document text
    • https://cdn-cms.f-static.net/uploads/4428038/normal_600e3193502d0.pdfIn PDF document text
    • https://labomozojaxige.weebly.com/uploads/1/3/0/7/130738499/191968.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411245/normal_602aa3c31ae32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381759/normal_5fff193578adc.pdfIn PDF document text
    • https://cdn.sqhk.co/pevedapev/iYtKKhh/heart_gold_soul_silver_emulator.pdfIn PDF document text
    • http://jusukigib.sportsontheweb.net/51572438403.pdfIn PDF document text
    • https://cdn.sqhk.co/motanunika/FVhgqgg/bug_s_life_butterfly_meme.pdfIn PDF document text
    • https://cdn.sqhk.co/naforokafe/7yhcgjF/zuwakuvugux.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/zukogi/41338807268.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/53372473360.pdfIn PDF document text
    • http://vigamoburijom.rf.gd/miwipusivewepefodujebof.pdfIn PDF document text
    • http://kejoluxukoso.rf.gd/35750918810.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/lopetevipubuwop.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/poster_maker_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/android_attributeset_drawable.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_off0000df9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 5372 bytes
SHA-256: 228b5a5416752b5215da53a6dbed3e4038d83ba13e5c042336af33f4355786b7
font_01_sfnt_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 10636 bytes
SHA-256: 34510ba6b1fda8d1ef7f50c8197cdce76b45305764ecc2972d513afd53a4571e

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