Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55a7eb1922d85f4…

MALICIOUS

PDF

75.5 KB Created: 2021-05-08 20:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af2bc66b205fec4a85fccdb2bf4c3993 SHA-1: 282f8f34c4a95d6e3457c724cfd3d503d7acf903 SHA-256: c55a7eb1922d85f4a5c7a3c6b55b33e20e2308816292b0deb44c0271ce617792
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'nipisod.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to salary information, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=how+much+does+an+hr+manager+make+at+target
    • http://microbestdigitalmeter.xyz/magic_treehouse_book_series_list2rn0f.pdf
    • http://filemarker.store/rosumaler3y.pdf
    • http://dream-stat.ru/927497640654tqn5.pdf
    • https://galofufe.weebly.com/uploads/1/3/1/3/131384583/nixibupuxepija.pdf
    • https://cdn.sqhk.co/toxodimina/aMHhjAY/what_do_you_learn_in_sales_and_marketing.pdf
    • http://pasendapp.online/115616626794gb5l.pdf
    • http://bowuxog.iblogger.org/driver_scanner_brother_dcp-_t300.pdf
    • https://static.s123-cdn-static.com/uploads/4464330/normal_5fcf2bf883c2b.pdf
    • https://bowemubunewoseg.weebly.com/uploads/1/3/0/7/130739536/zepoxatitoxerob.pdf
    • https://wanibezitajijo.weebly.com/uploads/1/3/6/0/136000154/digitizukojages.pdf
    • http://iwhite.space/cowbellpedia_2019_questions_and_answerssa0f0.pdf
    • https://budafamilefa.weebly.com/uploads/1/3/1/4/131452884/3324589.pdf
    • https://cdn-cms.f-static.net/uploads/4380680/normal_602af9d843fdd.pdf
    • https://static.s123-cdn-static.com/uploads/4467586/normal_5fddf770d315b.pdf
    • https://nexirexosevexos.weebly.com/uploads/1/3/4/5/134500935/6978007.pdf
    • https://cdn.sqhk.co/xuwadezab/MwU3hdA/2020_fantasy_football_rankings_espn.pdf
    • https://cdn.sqhk.co/patagarinixa/jihiiiO/7570967122.pdf
    • https://static.s123-cdn-static.com/uploads/4380088/normal_5fefb293348f1.pdf
    • http://berabujadew.22web.org/lewis_structure_worksheet_answer_key.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_d4ff1c38e94445c1a6b43dcec6ebc83a.pdf?index=true
    • https://7c3a386c-9197-44ff-a2a0-26a6be1b6260.filesusr.com/ugd/bba797_1ac8dc943a9348bf8db1f9c9be15b4fe.pdf?index=true
    • http://milodip.epizy.com/18940294014.pdf
    • http://jadigilotuziwir.rf.gd/acordes_de_guitarra_para_principiantes_canciones.pdf
    • http://fexizabo.rf.gd/rudogapurepog.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_off0000ea3e.bin
9f94431aa73290ea1fea3c5de3f0c318565d89c6509f8e498c455cc2b67fb138		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 5440 bytes
font_01_sfnt_off0000fca0.bin
e07dfebbc4d6f8d63207a7488dc0aaa8b951dc8437b3bf18912b9d6004ac9677		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA0 10472 bytes

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