Malicious PDF — malware analysis report

Static analysis result for SHA-256 44537b9b2d0e9ec8…

MALICIOUS

PDF

75.8 KB Created: 2021-02-21 05:10:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: ecbd458f8eeea506a1521264ae9d7b66 SHA-1: aa056a14d33e5b73b0a70f71dfce9816148cc376 SHA-256: 44537b9b2d0e9ec84a6f073686d3464a5c22fd5c072fb0b6fb6e58d686201ea7
254 Risk Score

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
  • 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=is+aggregate+output+the+same+as+gdp In PDF document text
    • https://pedagojewixa.weebly.com/uploads/1/3/1/3/131398360/2dda099.pdfIn PDF document text
    • https://gapidegit.weebly.com/uploads/1/3/1/3/131379699/01259fd134c.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwoxebu/jaalTXG/fikom.pdfIn PDF document text
    • https://desaviguwogo.weebly.com/uploads/1/3/1/8/131871994/5d95e2d39a2b6.pdfIn PDF document text
    • https://kukiramofup.weebly.com/uploads/1/3/1/4/131413837/8ea92.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/tunenijexe/kubibirikirofir.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/weather_channel_app_for_android_tv.pdfIn PDF document text
    • http://kivunakoxowufaf.epizy.com/facebook_basic_video.pdfIn PDF document text
    • http://jerasopel.epizy.com/jisejuxe.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/gunibuvigoforegoxudotapaf.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/free_video_views_for_instagram.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/acr_guidelines_for_glucocorticoid_induced_osteoporosis.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/yummy_mummy_guide.pdfIn PDF document text
    • http://bewegemoketofa.rf.gd/petuxutulovogemefib.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/mac_os_catalina_iso.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_off0000eb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2C 5280 bytes
SHA-256: 95aacb6800dfe43f3d0e03947710639c27bfc6a4ce26b428f68041b36fc5e37a
font_01_sfnt_off0000fcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF3 11000 bytes
SHA-256: 9bb6f9b3b17ba50d43b4a732be567fdcabacfee2662195ca9f5047be6c32e315