Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1b004306a33138…

MALICIOUS

PDF

78.5 KB Created: 2021-02-28 08:43:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d243b7655bedd912298a5dd0f4a9f7db SHA-1: 3c4b2cb61f316af88ab01a7217c5a6a21024b177 SHA-256: 2a1b004306a33138ea979957831521abb92e9e87533bf7cfcd9002c95da3c096
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are SEO-optimized and point to PDF files, suggesting a link farm or content-scraping operation. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially malicious websites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/wix?keyword=capitals+schedule+february+2020
    • http://ericksandoval.com/action_for_2-_4_players_pro_mod_apkeoxbt.pdf
    • https://kapejipe.weebly.com/uploads/1/3/1/0/131070538/2c7428452bb.pdf
    • https://zedabobosarafon.weebly.com/uploads/1/3/0/8/130813357/tabamised_rofexikijulamo_bitupivafuv.pdf
    • https://xewaxamuroz.weebly.com/uploads/1/3/4/5/134529724/naromogowadogu.pdf
    • http://kagivumuro.iblogger.org/tozemadaludaxizixakamin.pdf
    • https://xubivolimoba.weebly.com/uploads/1/3/0/7/130740090/46c32.pdf
    • https://zorusijumabek.weebly.com/uploads/1/3/4/8/134851431/wesapenurajinubusi.pdf
    • http://pusewuvi.medianewsonline.com/xekezezaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kikunojulejuj/aaron_ramsey_juventus_performance.pdf
    • https://s3.amazonaws.com/welanisowari/61676837692.pdf
    • https://s3.amazonaws.com/moduxanakuri/zofekesegofubutefe.pdf
    • http://dexifuv.epizy.com/11327869149.pdf
    • http://ninukak.epizy.com/casualty_tv_show_episode_guide.pdf
    • http://zudupaxub.myartsonline.com/fishing_rod_setup_for_catfish.pdf
    • https://s3.amazonaws.com/tixeligufokup/ayo_and_teo_rolex_dance.pdf
    • http://bezepegu.epizy.com/98644148734.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e31d.bin
f602dbfd7b9336458b19ba74d44d0a1d764b3e5abe937269193c0614b99a2235
pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 5664 bytes
font_01_sfnt_off0000f653.bin
219c50eb5f9de54547e75882c5791e81fccadeb83f743dbd1d6da3bbbca1c2be
pdf-font-stream PDF embedded font (sfnt) at offset 0xF653 1912 bytes
font_02_sfnt_off0000ff94.bin
2e89428d3d1da036cdaada255401dd70302dce499af6041fccf7362851a3d11e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF94 14168 bytes