Malicious PDF — malware analysis report

Static analysis result for SHA-256 857a020165f6a590…

MALICIOUS

PDF

51.5 KB Created: 2020-10-30 16:52:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6aaf634913a2cb07f8cc93bffc5c177a SHA-1: 2221c7a5e85e56916ee6320a02eb002709bc04f9 SHA-256: 857a020165f6a5902a0ba976d93628260578888f67aeb26615c95e24d7e2dd91
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://cctraff.ru/123?keyword=how+to+find+the+zeros+of+a+function+with+5+terms In PDF document text
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/7939735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410216/normal_5f93a76833137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385198/normal_5f99c68bcfca9.pdfIn PDF document text
    • https://xusawoji.weebly.com/uploads/1/3/0/7/130739635/dobexukojetovadof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393626/normal_5f8fffa6bcf93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_5f91f204367f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369933/normal_5f8c0e9fc7563.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/ropuba/tabela_brasileiro_serie_b_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/muvunekagok/xetaxojetitefukujofoda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3562/2552/files/westclox_lcd_alarm_clock_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/certificate_of_analysis_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/dexekibezusuniruluxez.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/kowalusoxigixavixu.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/cinema_4d_xpresso_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/general_biology_college_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/gegelonosabofozifekajom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/6544/3239/files/megumelijokujopegewepib.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6386 5456 bytes
SHA-256: 89b8355f2327ac22e70338f03e4670e296b932fcb4b2dbe1734d2443b733ae93
font_01_sfnt_off00007610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7610 10952 bytes
SHA-256: 8ec699bab0e68619c8369a565fa3c715a3bc91b0642133e72f8526163671c4cf
font_02_sfnt_off00009be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BE8 16064 bytes
SHA-256: 1445775b9a23a908738d4b50a39a0185987e6b0dbf67120e278101207b724a2a
font_03_sfnt_off0000b089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB089 6084 bytes
SHA-256: f5fe2de525700542684e23a11f1cb185b9ffab030677c6a48f3d5a1088c9e53b

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