Malicious PDF — malware analysis report

Static analysis result for SHA-256 3277ef22aa2f554a…

MALICIOUS

PDF

73.2 KB Created: 2021-04-04 19:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f622b72971c141727ad6b2f7e7f7476f SHA-1: 79337fab2167c9d2ed5afc9f8d814974b90c0117 SHA-256: 3277ef22aa2f554a20cfaa9134bf87f92a709e165465f360d597da7a285098c4
96 Risk Score

Malware Insights

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

The PDF file contains embedded URLs, one of which is flagged as malicious and directly linked to the document's apparent theme of a 'scientific notation practice worksheet'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the presence of external URIs and the nature of the detection suggest the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/wix?keyword=scientific+notation+practice+worksheet+chemistry
    • https://static.s123-cdn-static.com/uploads/4392463/normal_5ff1927e36d43.pdf
    • http://firstdoctor.xyz/god_of_war_chinese_apk_gameo9zac.pdf
    • https://cdn.sqhk.co/sakajererudi/difigig/21755729877.pdf
    • http://creditpm.com/what_does_flock_meanptgzp.pdf
    • https://cdn-cms.f-static.net/uploads/4451023/normal_5fd7c629b8bca.pdf
    • https://cdn.sqhk.co/zuzipogowita/jjn6ahf/love_quotes_stickers_for_whatsapp_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4456372/normal_5fd98a5e1870c.pdf
    • https://cdn.sqhk.co/gobajejuz/DuggUig/setisowefakivaj.pdf
    • https://cdn.sqhk.co/tiwumixe/d7gejc5/all_star_weekend_basketball_shoes.pdf
    • https://cdn.sqhk.co/detokelixipi/cgdifzw/zigasonagugitij.pdf
    • http://tricitysikhs.com/92192174533s20gy.pdf
    • http://esportzmlevent.com/5034794050890x16.pdf
    • https://cdn-cms.f-static.net/uploads/4424040/normal_600fb914c5275.pdf
    • https://cdn.sqhk.co/wuluzajiroz/gyjcibp/dejododobedidojez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/ce1670eb-757b-41e9-80ea-0d80f6dcd993/beziwiwewojomopobulurun.pdf
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_c900fb81bae7437cbadf757158f3cca0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fad249f2-a27b-4bb0-9858-240f138c9c80/20314319133.pdf
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_2fbe11f582ee4807960abda03604cd04.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8b7a2056-6952-47aa-a405-0dd791d55157/is_the_aimpoint_t2_worth_it.pdf
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_079ba422af45463d912ce2841e09d2b2.pdf?index=true
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_2aea33104f29413e880e38342a03621c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9859d0cd-28d7-4a96-b1d5-60a9ce63cc06/fizujiluwenofevowabiw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4f0.bin
8e8c8b6c6ab4a4bf4ed48150b44d28d39c6b5a9e5ea9ce3f60c41509ea2d850e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F0 5372 bytes
font_01_sfnt_off0000e711.bin
b376299bcb5f4d77d1225ea55958abf72f077565b8aeffe29b10ff5ef19932c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE711 9860 bytes
font_02_sfnt_off000108e0.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108E0 4324 bytes

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