Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e93b84f4ac5bc66…

MALICIOUS

PDF

76.2 KB Created: 2021-03-29 11:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da9a519a671d5debfa73432fe0bc7639 SHA-1: 2481a8ea2c476e22ce0b3529af2ce7b2b608310b SHA-256: 0e93b84f4ac5bc66a591e167ed2389e83612e0800e660c1d846a5090003bcd01
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to educational content to mask the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=calculus+related+rates+worksheet
    • http://gajonedorebuko.mywebcommunity.org/wirifad.pdf
    • http://koteyarn.moscow/tizesofitukisulefenevomhkj.pdf
    • http://digitalliteracyinstitute.com/easy_painting_ideas_for_beginners_flowersox0mx.pdf
    • https://kixivoveluvib.weebly.com/uploads/1/3/0/7/130775150/1833110.pdf
    • http://mon-fortuneo.best/feeling_alone_images_freeo0s5d.pdf
    • https://nuvuxupu.weebly.com/uploads/1/3/4/5/134507381/042e7.pdf
    • http://gonalotuturopil.mywebcommunity.org/tuzedobexumaru.pdf
    • http://gapilojazixo.getenjoyment.net/megger_fluke_1507.pdf
    • http://about-fb-support.com/25530519257nci3n.pdf
    • http://gexopidikimo.mygamesonline.org/medical_english_dialogues.pdf
    • https://wewiwefiwowofaj.weebly.com/uploads/1/3/4/3/134369931/9057223d.pdf
    • http://idealslim-italiaoficial.site/backbeat_fit_3150_pairinglmujk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f5f74d4f-f804-4d9b-9bfa-9964b2756261.filesusr.com/ugd/e389b3_3008177cce764fce842809c343c04a74.pdf?index=true
    • https://s3.amazonaws.com/pewebopufupe/bekafipivax.pdf
    • https://s3.amazonaws.com/lekezaru/dbrau_exam_date_sheet_2020.pdf
    • https://413f70bc-0247-4a04-a3fc-eabb14e2b93f.filesusr.com/ugd/f18ee6_abf1b2fdad824c50b0244b86e777efcb.pdf?index=true
    • http://gapoxuvopa.onlinewebshop.net/pabenigogumegujekuxuzug.pdf
    • https://81da36f4-dec6-4bf4-836b-19ed67500659.filesusr.com/ugd/5fd5c1_8b905e0e6a7848269ab030f912cfd3fa.pdf?index=true
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_8d4f7d54a2ac4e3e939fcffa02134915.pdf?index=true
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_bd8ee3691207445bbb4ab6bc72ad43ef.pdf?index=true
    • https://s3.amazonaws.com/tonisefoteka/what_size_caravan_can_a_ford_ranger_tow.pdf
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_d3b47354d6d1472e97d3eff7d65575f5.pdf?index=true
    • https://s3.amazonaws.com/zesotat/21646959510.pdf
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_e9841dc1ae924990b9827c727c7793e4.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed1a.bin
ab59d5ab4633a450eee6dad60589438e29888402a8f058dddb2324b4c25a062e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED1A 5088 bytes
font_01_sfnt_off0000fe6a.bin
fa04870809f449598d61de6028b22f1ef8d5077a60b22c04730962c3827dd916		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6A 10792 bytes

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