Malicious PDF — malware analysis report

Static analysis result for SHA-256 738894a50dcb43e1…

MALICIOUS

PDF

74.7 KB Created: 2021-03-01 10:28:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a1ffeb93537abf977cc5df4048984939 SHA-1: d6c31beea8c7c61e2c3ba4715f5f1e9240eaac2c SHA-256: 738894a50dcb43e1f2b05cb190cc67ed799d49fef4c3b598e0964be3c17149dc
196 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://seumenha.ru/strik?utm_term=can+you+factory+reset+an+iphone+4+without+a+computer PDF link annotation
    • http://samozanyat.info/rosen_s_emergency_medicinexct3t.pdfIn PDF document text
    • https://nilazarokidimud.weebly.com/uploads/1/3/4/4/134495838/921630.pdfIn PDF document text
    • http://virnet77.ru/992038711930w39g.pdfIn PDF document text
    • https://sobemifukoku.weebly.com/uploads/1/3/4/8/134887972/velabowenizubaweze.pdfIn PDF document text
    • http://sq11mini.com/vilodunikovoxisajobvyntd.pdfIn PDF document text
    • http://pro-komp-master.website/kawasaki_vulcan_1500_service_manualc5lq6.pdfIn PDF document text
    • http://gufutaca6.xyz/aashiyana_mera_female_song_mr_jatta6wjv.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/793600085328ifu7.pdfIn PDF document text
    • http://judijemavup.22web.org/boyosh_16_te_prem_video_song.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/lumixi/3766599810.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/oll_algorithms_2_look.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/is_there_a_demand_for_interior_designers_in_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/91767144885.pdfIn PDF document text
    • http://mikusadetov.rf.gd/22512201373.pdfIn PDF document text
    • http://dogamesesokuj.rf.gd/almahyra_bahagia_tak_bersama.pdfIn PDF document text
    • http://foxadawimuwewar.epizy.com/varulezunugixenafosuw.pdfIn PDF document text
    • https://s3.amazonaws.com/tamovagag/91238997393.pdfIn PDF document text
    • http://refewededuxita.epizy.com/animal_flip_flop_size_guide.pdfIn PDF document text
    • http://mevonaku.rf.gd/1276869533.pdfIn PDF document text
    • http://kebipilukav.rf.gd/chowrasta_band_cheyi_cheyi_mp3_song_download.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_off0000e811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE811 5412 bytes
SHA-256: 8fc698bd5c7be9ac0a00efadaf7c73b65e9ff90e943d6cdf27bef51c75b15d75
font_01_sfnt_off0000fa73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA73 10136 bytes
SHA-256: b8c5edfe1f6877448c8b1378230464284b8186cf54f131f581af386f7f31e6ff

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