Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd683f24f287607f…

MALICIOUS

PDF

77.8 KB Created: 2021-03-31 12:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b6b0cfc252fdee1337a886f92aa4e4e SHA-1: d7a414c7d9cafbacfa98195428a7d53475c7153f SHA-256: cd683f24f287607f3409489d1caf1d10b3d32716c76342e5ed667ddcb57c890f
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to 'resalured.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'worksheet molecular compounds answers'. No scripts were extracted, but the presence of external URIs and the overall malicious verdict strongly indicate an attempt to redirect users to malicious content.

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://resalured.ru/wix?keyword=worksheet+molecular+compounds+answers
    • http://xutifufaxe.mypressonline.com/42928778146.pdf
    • http://pagudovor.iblogger.org/15_days_practice_for_ielts_writing.pdf
    • http://nuvotana.22web.org/62066606720.pdf
    • https://cdn-cms.f-static.net/uploads/4390641/normal_602a1d181d78f.pdf
    • https://static.s123-cdn-static.com/uploads/4504870/normal_5fe3f7019c19e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d6eb3ca4-6931-44cd-b9c6-25d69a507c97/fexadagi.pdf
    • http://gejinafanijeju.epizy.com/best_recipes_for_magic_bullet.pdf
    • http://dolanuvusipegu.myartsonline.com/exercice_amortissement_dgressif.pdf
    • https://uploads.strikinglycdn.com/files/dd82f4f0-021c-4380-802f-c2ab31480995/how_to_speak_english_fluently_free.pdf
    • http://kuxoxokazutuv.myartsonline.com/vatefi.pdf
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_2f37c6fc4c0942bfbfb4c00fa6e60a10.pdf?index=true
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_6e0bc1715e744005be0fc633ea0b79b9.pdf?index=true
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_01499e91d68740cc8406d157c5864ed3.pdf?index=true
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_d5f561a9ef5a4c0984dbd4c7bf987d80.pdf?index=true
    • http://fepaseweg.epizy.com/13073944560.pdf
    • http://vonezilomobupir.rf.gd/sitting_is_the_new_smoking.pdf
    • http://lunewexaxepo.epizy.com/38244508141.pdf
    • http://fepusum.onlinewebshop.net/62934398565.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_off0000f0e8.bin
2311547c7019db5fa4766ec84c684c06ab4a14de1bdb166ade1c2e7293ce935e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 5480 bytes
font_01_sfnt_off0001037b.bin
40073eb89df759a67748cc2fea13d2551bdfb5fab402a732362201ce196ad5e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1037B 11600 bytes