Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5aa0b4e7e4672b1…

MALICIOUS

PDF

76.1 KB Created: 2021-02-20 11:25:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70d80b3e31e3630d094077ee9624f309 SHA-1: 2c5ddfa58b5c1ea8c0f302b6ff56ee7cb05c6ad7 SHA-256: d5aa0b4e7e4672b1fdd0b1da3870bbe8462a60d1455d75cb459a8c7df679cbe4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicating it is part of a link farm designed to drive traffic to other sites. The document body suggests a lure related to 'algebra 2 chapter 5 cumulative review answers' to entice users to click the embedded links. ClamAV and ML classifiers confirm its malicious nature, likely as a phishing or SEO spam document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wix?keyword=algebra+2+chapter+5+cumulative+review+answers
    • https://wizudagusosok.weebly.com/uploads/1/3/5/3/135317744/mofesega_xozigek_roxotekaxetowo.pdf
    • https://derajuxojop.weebly.com/uploads/1/3/1/4/131452827/de5893b94.pdf
    • https://static.s123-cdn-static.com/uploads/4393759/normal_5ff78e172e175.pdf
    • https://cdn-cms.f-static.net/uploads/4474446/normal_603039eef2718.pdf
    • https://cdn.sqhk.co/bepoweruga/jj7iaii/air_force_fighter_pilot_height_requirements.pdf
    • https://cdn.sqhk.co/suxumeva/9cAOgc0/sun_direct_online_recharge_sri_lanka.pdf
    • https://cdn-cms.f-static.net/uploads/4482406/normal_600f1d1026fa7.pdf
    • https://kunatelifarak.weebly.com/uploads/1/3/2/7/132712072/vikofufuraniwiredu.pdf
    • https://cdn-cms.f-static.net/uploads/4412151/normal_6015ffdb1fbba.pdf
    • https://cdn.sqhk.co/duzimisese/9Dhgw52/nurajawexezopif.pdf
    • https://cdn-cms.f-static.net/uploads/4411696/normal_602c64e9f3962.pdf
    • https://cdn.sqhk.co/feguzuvubut/hz3gj44/26638338844.pdf
    • https://static.s123-cdn-static.com/uploads/4415537/normal_5fc99069a2e86.pdf
    • https://cdn.sqhk.co/zujumatatub/hqghidH/film_quote_quiz_buzzfeed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://raxaxeve.rf.gd/38413770322.pdf
    • http://bupujipa.epizy.com/51892310532.pdf
    • http://vagakidid.epizy.com/how_do_i_know_if_my_neff_oven_is_self-cleaning.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e976.bin
753059a22098487f79ac04170f3f1bdf47bc45e7c80b48e6e38e3c70346ecd21
pdf-font-stream PDF embedded font (sfnt) at offset 0xE976 5884 bytes
font_01_sfnt_off0000fd6f.bin
f0a0af2a3bf6fc9d376339cf897317f1136aaec3266115d513e0e6a080b9b292
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6F 11000 bytes