Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b6aab322247ec6…

MALICIOUS

PDF

74.5 KB Created: 2021-02-20 05:05:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 60a8f1b41c5353dff4e0d2586cfa94c0 SHA-1: e13454bc43ef6aa06e4e1fb234a0448263c0a284 SHA-256: 36b6aab322247ec673e218753741f90b2b456a85ed5c8bb87de5f43f78d8deb8
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, and contains numerous links to external resources. Several of these links point to known malicious redirectors or are part of a link farm, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains text related to 'cheese curds' and 'wkhtmltopdf', which may be part of a lure or indicate the tool used for generation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=who+made+cheese+curds In PDF document text
    • https://cdn.sqhk.co/rufopunuk/hjajjXL/pamasabulilojefoz.pdfIn PDF document text
    • https://tonewebebajuja.weebly.com/uploads/1/3/5/3/135319275/sawajezametevomilo.pdfIn PDF document text
    • https://cdn.sqhk.co/fixakozumad/jdgHhjX/zokojofadanepaduzitu.pdfIn PDF document text
    • https://cdn.sqhk.co/bowawugafux/bniggig/oscar_isaac_star_wars_criticism.pdfIn PDF document text
    • https://cdn.sqhk.co/maxevurux/jetCjay/nail_biting_disease.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/Pjawljb/english_reading_practice_passages.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/x3nihjd/bus_rush_hack_android_1.pdfIn PDF document text
    • http://cafe-cok.ru/daily_use_english_vocabulary_with_meaning_in_hindisgfs0.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/bJvSMA9/i_will_eat_it_all_up_song.pdfIn PDF document text
    • https://cdn.sqhk.co/vakujediraw/cmji0if/wozavafugofumowoxikezomi.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/hZjhf7o/76010824906.pdfIn PDF document text
    • http://epipog.com/billie_s_bounce_tabkj45z.pdfIn PDF document text
    • http://speak4pro.com/america_now_robert_atwan861hv.pdfIn PDF document text
    • https://wanomumopanud.weebly.com/uploads/1/3/1/3/131379193/3001141.pdfIn PDF document text
    • https://cdn.sqhk.co/doxutijewu/fjfgnEz/that_s_life_lyrics_in_spanish.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/wipotegadodorek/chartboost_folder_android.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/85213589199.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/lemufib.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_off0000e62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62A 5160 bytes
SHA-256: 7f4f8d5999a34e9a55a40afb4b79dced5703f604ebf0117e6cace73437afe4f9
font_01_sfnt_off0000f790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF790 11136 bytes
SHA-256: 15c9b2d74ebb81d7c94bae437bc7670d7dfc3495edb9e54e3f6fdb2a7109d82a

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