Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9bb9a91d5176d6…

MALICIOUS

PDF

78.9 KB Created: 2021-05-09 05:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 80ec2f8aab4906cad94d1446f3097b19 SHA-1: 57236c59c03284eaea1bd24a9548c174903a232d SHA-256: 3e9bb9a91d5176d6da6d5ebb407a0db18117d58a2a3b5bbc454b0cc837f42942
156 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. 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 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://gimoguvi.ru/strik?utm_term=how+much+should+it+cost+to+install+a+ductless+mini+split PDF link annotation
    • http://koxelovanalimu.getenjoyment.net/how_to_load_a_bostitch_electric_staple_gun.pdfIn PDF document text
    • http://momarivido.mypressonline.com/dinakaran_tamil_news_paper_download.pdfIn PDF document text
    • https://rifodajawu.weebly.com/uploads/1/3/0/7/130739776/lumowudofifasor.pdfIn PDF document text
    • http://zapitexidij.mypressonline.com/ayyubid_architecture.pdfIn PDF document text
    • https://vanazufir.weebly.com/uploads/1/3/2/7/132740694/647d41544b319.pdfIn PDF document text
    • https://retelajipubo.weebly.com/uploads/1/3/4/7/134700068/nujaxomoremo.pdfIn PDF document text
    • http://joxitikoki.getenjoyment.net/92213029459.pdfIn PDF document text
    • https://wipedevibenisi.weebly.com/uploads/1/3/5/3/135315865/sowuxogesigekij-wodobuvuzil.pdfIn PDF document text
    • http://newoxoxi.mywebcommunity.org/67609771986.pdfIn PDF document text
    • https://galojonebe.weebly.com/uploads/1/3/4/3/134353990/fuzop-zonusipudon.pdfIn PDF document text
    • https://lalidusuferub.weebly.com/uploads/1/3/4/4/134440540/vaxozidugal_dabon.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/rumitujinelubomojexowil.pdfIn PDF document text
    • https://gebusoju.weebly.com/uploads/1/3/0/9/130969184/3f4821a4a660dc.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/daniwodug/43009693478.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/sheet_music_careless_whisper.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/vazukijebusife.pdfIn PDF document text
    • http://mijovutotukedes.onlinewebshop.net/58754441947.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/jurewimefezusefona.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/32951858220.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/hssc_clerk_answer_key_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/zufukedolizu.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/hey_song_clarinet_sheet_music.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_off0000f782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF782 5268 bytes
SHA-256: 845a701285d4b71d7791300dc44ecb547cced96af5b8eb827e906e056013c8d9
font_01_sfnt_off0001095c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095C 10812 bytes
SHA-256: faeb902af204ad2b14eca15f95583fc63322209165627d17571623dae0fa8ca0

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