Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e0b5a04e436c44…

MALICIOUS

PDF

77.6 KB Created: 2021-03-01 00:42:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ecda3e4d8f3eba6ca0d2b4836173fda SHA-1: 1e57b1efa0463fca2789a6d510ec5fde23fea053 SHA-256: 42e0b5a04e436c449409033b8bdd5520233c698388d115a35e315e9b463d51fa
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 ClamAV and an ML classifier. It contains an embedded URL, https://nipisod.ru/wix?keyword=comic+book+checklist, which is likely used to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a 'comic book checklist' lure, aligning with a phishing attack pattern.

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=comic+book+checklist
    • https://cdn-cms.f-static.net/uploads/4447640/normal_602da53190d5b.pdf
    • https://zexotanus.weebly.com/uploads/1/3/0/8/130873712/5348a205ee32.pdf
    • https://dubibezu.weebly.com/uploads/1/3/1/4/131453247/nilarusurux.pdf
    • http://gejokakop.mygamesonline.org/410786759.pdf
    • http://momentshop.space/what_is_meant_by_international_tradednwvf.pdf
    • http://idealica-uficialeitalia.website/28327187492yxj61.pdf
    • http://vutisonoj.sportsontheweb.net/rock_candy_xbox_one_controller_walmart.pdf
    • https://static.s123-cdn-static.com/uploads/4484126/normal_5ff2d6c8e0983.pdf
    • http://fawikenaxalu.scienceontheweb.net/good_transition_into_first_body_paragraph.pdf
    • http://sunepoxuvigos.66ghz.com/causes_of_absolutism_in_europe.pdf
    • http://bcpzon4segurabetaviabcp.com/audiojungle_pricing_guidehsn1p.pdf
    • http://salonop.xyz/fefusavobemomevavafat7foi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zerejibixupav/best_wireless_earbuds_for_android.pdf
    • https://s3.amazonaws.com/luramamelolem/carnarvon_gorge_guided_walks.pdf
    • http://lokatetaf.rf.gd/oxford_dictionary_english_to_tamil.pdf
    • https://s3.amazonaws.com/gowebabuxogiro/tamil_cartoon_full_movie_free.pdf
    • http://zapulozamatuwe.epizy.com/68381884904.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_off0000f375.bin
2f23f4e7f257637ec9cc32b1996650f9333cd033b7b4c05c78327bac147afc67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 4844 bytes
font_01_sfnt_off000103ca.bin
45a5db2c8a44d9ddcf921ae3d03b3b5699c139c4d160bd1278f758fa4fcfdacd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103CA 10928 bytes

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