Malicious PDF — malware analysis report

Static analysis result for SHA-256 797bdb5cb2c1ee83…

MALICIOUS

PDF

47.6 KB Created: 2020-10-04 10:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 7c6456a2c16495b55114e0e01d1766d8 SHA-1: ef98f347e019fc30e99e6dd59dc5b2bd3e377f54 SHA-256: 797bdb5cb2c1ee83f4bcee0e33c3d32a1246df15b1fe3819735781013a820da6
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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/strik?keyword=compact+key+for+schools+workbook+answers In PDF document text
    • https://site-1036850.mozfiles.com/files/1036850/fulejapetevusinu.pdfIn PDF document text
    • https://site-1039393.mozfiles.com/files/1039393/62274689061.pdfIn PDF document text
    • https://site-1038679.mozfiles.com/files/1038679/70534095847.pdfIn PDF document text
    • https://site-1037115.mozfiles.com/files/1037115/73287852059.pdfIn PDF document text
    • http://nofasi.junpengli.com/uploads/1/3/1/4/131406062/lujurijoxugul-tilulemum.pdfIn PDF document text
    • http://vosipuja.solonvotes.org/uploads/1/3/1/1/131164021/lujamolisofonalimepo.pdfIn PDF document text
    • http://files.my-english-lesson.us/uploads/1/3/1/4/131482887/wemegoju.pdfIn PDF document text
    • https://site-1039783.mozfiles.com/files/1039783/moludesasirilol.pdfIn PDF document text
    • https://site-1040794.mozfiles.com/files/1040794/44637059900.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0483/2464/0932/files/futon_bunk_bed_instruction_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/5653/4182/files/mosufug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2275/9582/files/14507057358.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/6372/4200/files/19264714605.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA8 5416 bytes
SHA-256: 7bb78ca4d2ff9b3c1b375240dad8eb664d2363a469e83cc7de12977329d27962
font_01_sfnt_off00007f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F03 10832 bytes
SHA-256: b73cca7788cfa414deea6caec66909558e6acde8bce912a0cb196eab50e0be1a
font_02_sfnt_off0000a337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA337 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71