Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1ec6baae84b80c…

MALICIOUS

PDF

78.6 KB Created: 2021-04-04 11:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 64f125945fa44df23892fc9ae263c0c0 SHA-1: 595a172f87a05a14ecc75d22f991cf2b3ee6456b SHA-256: 3a1ec6baae84b80c94607d6f6c11db4eb71e2b9698bd65f92faa36c4ff8e6a20
186 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 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://resalured.ru/strik?utm_term=oldways+4-week+mediterranean+diet+menu+plan+book PDF link annotation
    • https://cdn.sqhk.co/kivipemo/yUjhOie/kidafodalatariforinoporeb.pdfIn PDF document text
    • https://cdn.sqhk.co/terasovo/DBhjPjg/31291581324.pdfIn PDF document text
    • https://cdn.sqhk.co/nomowaxiwo/hfTD0VZ/43262218788.pdfIn PDF document text
    • http://bukawavado.medianewsonline.com/paruluberabexa.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/he0gihg/tojojebozovemisuwiwenug.pdfIn PDF document text
    • https://cdn.sqhk.co/tabuguran/qih5Ljj/joy_box_puzzles_all_in_one_printer.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/gd6jjjg/too_many_birds_lyrics_meaning.pdfIn PDF document text
    • http://tuzupibu.scienceontheweb.net/blank_sheet_music_guitar_tab.pdfIn PDF document text
    • https://cdn.sqhk.co/jiwosowo/f8bjije/wepiw.pdfIn PDF document text
    • http://xerotigatagere.22web.org/enfold_avia_template_builder.pdfIn PDF document text
    • https://cdn.sqhk.co/wanoposuj/jiMaWjj/smart_maps_offline_apk.pdfIn PDF document text
    • http://rowajenuw.iblogger.org/cyborg_android_difference.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/eo2njic/aoi_bungaku_sub_indo.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/zepamemovijodotabatojezi.pdfIn PDF document text
    • http://suzupuwejal.mygamesonline.org/1067340450.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/liwofamomamuwinen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bc881323-2374-4635-a2b7-f126f9929bd8.filesusr.com/ugd/546a35_55efca7d076b4b7ab52617adda9a6272.pdf?index=trueIn PDF document text
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_fdf18636755047b59a2e72ceffa58b8b.pdf?index=trueIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_083a7f9f59534bfbac653476e0c2c21a.pdf?index=trueIn PDF document text
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_d5cb345bbde94d0d8ac1fea9792bf1f6.pdf?index=trueIn PDF document text
    • https://b3df6b87-ca8d-4c26-b815-8c697753997b.filesusr.com/ugd/896a32_24f5619395a6414da0f46872a337794d.pdf?index=trueIn 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_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 5648 bytes
SHA-256: a3db23e43c754c4e6f488ffea178d2b9bfe42d69277da0adc0e8c9100e0196e1
font_01_sfnt_off00010747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10747 11052 bytes
SHA-256: ad6e7e6db0e73e91a88d91df6a882196fa9d90a28cee1b8b9ee1fa5be7bc592c

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