Malicious PDF — malware analysis report

Static analysis result for SHA-256 144f091532c2b700…

MALICIOUS

PDF

75.4 KB Created: 2021-03-18 15:55:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ef8ee15e491fb8f8d4b73c80bb3997ec SHA-1: 205e1ad73266f8d66c3e752ee007eec76932087c SHA-256: 144f091532c2b7002d269cb53d95e183ec143b092752be1d1c5f8ffa47ae9277
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically as a phishing or trojan distribution vehicle. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=husky+2600+psi+pressure+washer+parts PDF link annotation
    • https://cdn.sqhk.co/zawukomofise/jdzjbGE/ideal_gas_law_practice_worksheet_key.pdfIn PDF document text
    • https://mubasaji.weebly.com/uploads/1/3/4/8/134846322/5988092.pdfIn PDF document text
    • https://girosiwubu.weebly.com/uploads/1/3/0/7/130740458/vimukugu.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/ibugeVr/femoximufuzuv.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/WXWRthg/hampton_bay_table_top_fire_pit_propane.pdfIn PDF document text
    • http://justamorem.com/10400004190e3g3z.pdfIn PDF document text
    • https://cdn.sqhk.co/baxafapunubi/jikiheT/1653422684.pdfIn PDF document text
    • https://reborugavuzak.weebly.com/uploads/1/3/4/7/134736286/f21d6c43.pdfIn PDF document text
    • http://zhenskiizhurnal.ru/b_braun_malaysia_annual_reportdi0lj.pdfIn PDF document text
    • http://zukasegepeni.22web.org/how_much_was_gold_per_ounce_in_1985.pdfIn PDF document text
    • http://mosquito.codes/102160459384k6rv.pdfIn PDF document text
    • http://zusozujowumid.iblogger.org/what_is_simplex_in_computer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/computer_course_certificate_format.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/39563544288.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/14044216872.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/11223420379.pdfIn PDF document text
    • https://s3.amazonaws.com/sudevejerifu/bed_sheet_sets_queen.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/love_test_calculator_game.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/econometrics_models.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/caucasian_chalk_circle.pdfIn PDF document text
    • http://nabifasilazug.rf.gd/comment_joindre_deux_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/replay_ken_grimwood_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/48249925552.pdfIn PDF document text
    • http://pixoriwabivonol.rf.gd/selesafuwar.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE719 5520 bytes
SHA-256: a4900a24d9ac89dd9cfaf9922789095b9d85bafcdb033d70c51d03d22ac39eb0
font_01_sfnt_off0000f9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F2 10664 bytes
SHA-256: 0bc41097e94401584266157c162292115f3091aa4f998e317adf597c3771a6e6

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