Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d21b79bab27d6d…

MALICIOUS

PDF

74.0 KB Created: 2021-01-29 17:01:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 9474160d3bd6f5405972bab0e872b573 SHA-1: 34503973c15111cd761b0ea6d91a5bd0f5c0cdcd SHA-256: 33d21b79bab27d6da79caf47c2cebb8b68ac3f16b1c1234e800544685594f59b
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ggtraff.ru/wb?keyword=platformer%20rpg%20maker%20mv In PDF document text
    • https://static.s123-cdn-static.com/uploads/4404983/normal_5fec3c2594cb1.pdfIn PDF document text
    • https://ziziwatir.weebly.com/uploads/1/3/4/7/134713039/gasopu.pdfIn PDF document text
    • https://xijiruxexewige.weebly.com/uploads/1/3/4/7/134725886/8ff171a566.pdfIn PDF document text
    • https://rifojiditesi.weebly.com/uploads/1/3/1/3/131379396/rolirodopuxufutu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413019/normal_5ffeb1e70e447.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384145/normal_5fe58a37c1c1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419822/normal_5fe8b8f7cedd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387031/normal_6006134779ed5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413345/normal_5ff689b34b758.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413362/normal_5fcb423f54ab3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454967/normal_6007ec51bd785.pdfIn PDF document text
    • https://betixajivuf.weebly.com/uploads/1/3/4/9/134900014/pivoworifip.pdfIn PDF document text
    • https://pafajawu.weebly.com/uploads/1/3/2/6/132682051/017f8a1e03ebe.pdfIn PDF document text
    • https://nitiruminaxodax.weebly.com/uploads/1/3/0/7/130738633/0d3fd4c0682128e.pdfIn PDF document text
    • http://onlinekartiadesi.com/island_survival_short_storya8n15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385863/normal_5fc7b989153b9.pdfIn PDF document text
    • http://copyright-services-us.com/gunazepulijauoo5v.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/fokapikow/yiruma_reminiscent_sheet_music.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_off0000e042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE042 5168 bytes
SHA-256: 0beea13f24b57241a90608a72c06294daf5ed3d59c8f60b26298407fa651a4dc
font_01_sfnt_off0000f1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D0 11932 bytes
SHA-256: 621182c744c3c8b0e40e079f108cb903d970701dd18afa86269588eff5932439