Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7533e4ae38fc762…

MALICIOUS

PDF

76.0 KB Created: 2021-03-13 20:39:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b82817d9edac2d66228df8fa06387cb SHA-1: df10d80826452f030570c41ee0a114cd98a2a29e SHA-256: c7533e4ae38fc762db6e26f43aa27010ece597f7c3c77bfa169458489bef97d9
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL, 'https://nipisod.ru/wix?keyword=2-8-2+mikado+blueprints', which is the primary indicator of compromise. The document body, though heavily obfuscated, suggests a lure related to 'mikado blueprints'. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://nipisod.ru/wix?keyword=2-8-2+mikado+blueprints
    • https://cdn-cms.f-static.net/uploads/4403260/normal_6031b644a02a9.pdf
    • https://static.s123-cdn-static.com/uploads/4444096/normal_5fe57002edf79.pdf
    • https://static.s123-cdn-static.com/uploads/4372080/normal_5ff70d35936c2.pdf
    • https://cdn-cms.f-static.net/uploads/4479942/normal_5fd83142a64bb.pdf
    • https://gifaxopolipo.weebly.com/uploads/1/3/0/7/130739444/gosajuka.pdf
    • http://bidukesures.22web.org/what_is_a_good_social_studies_fair_topic.pdf
    • https://cdn-cms.f-static.net/uploads/4405194/normal_604429f3d9351.pdf
    • http://smartbright.club/lesuwuwefupyu0uh.pdf
    • https://lemefiware.weebly.com/uploads/1/3/4/0/134017231/9b03e07.pdf
    • https://lesezisuwo.weebly.com/uploads/1/3/4/1/134109364/68c1c13f8.pdf
    • https://cdn-cms.f-static.net/uploads/4383687/normal_60233d92d2296.pdf
    • https://static.s123-cdn-static.com/uploads/4424040/normal_5fe5677acac21.pdf
    • http://moshon.space/bawli_tared_video_song_tinyjukeajb91.pdf
    • http://mmamba.ru/unseen_comprehension_worksheets_for_grade_3n8e6k.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://28ae28a3-27cc-4d38-be83-0de1f6925f83.filesusr.com/ugd/454016_d948599e36894012b7ca38f2f1bd633e.pdf?index=true
    • http://tumajazumi.rf.gd/bagidiribesa.pdf
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_566f1e574e0048e2a1729461bf99ded5.pdf?index=true
    • http://ruriwujuvuwa.epizy.com/61670848630.pdf
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_7670ef5c126a49f78fcd9744eee3a539.pdf?index=true
    • 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_off0000e8e2.bin
cf1637cffccfe208aba5334c7a08b0ebcb4376e722dabb81f49dfc1f9873b9d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E2 5572 bytes
font_01_sfnt_off0000fbb9.bin
c580d0493e0c552b53cfcde36432cb786e0904158233cae6cf220ed659e66a16
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 11252 bytes