Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb45f6a8e7f6070d…

MALICIOUS

PDF

74.2 KB Created: 2021-03-28 04:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffe63413557680bac4b3df97a7fd05ff SHA-1: 3c2e13ed33c5339e82cf9beb44baa123b513af4f SHA-256: eb45f6a8e7f6070dc6874f51079b6ab5d9850d3a56558b10590ea1abfc893650
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant portion pointing to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing or malware distribution. The embedded URL and the document's apparent purpose of acting as a link farm support the classification as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-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://maypoin.ru/wix?keyword=polynomial+inequalities+worksheet
    • http://jotijitod.66ghz.com/aiag_advanced_product_quality_planning_apqp_2nd_edition.pdf
    • https://cdn-cms.f-static.net/uploads/4460457/normal_6021cf297c2a8.pdf
    • http://talivur.22web.org/why_do_the_japanese_use_chinese_characters.pdf
    • https://cdn-cms.f-static.net/uploads/4506063/normal_603b28ff0c1dc.pdf
    • https://static.s123-cdn-static.com/uploads/4495055/normal_5fc70e24edd59.pdf
    • http://pojawokoxenin.iblogger.org/9358349957.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mipizaju/lokemawi.pdf
    • https://s3.amazonaws.com/litunux/bisacodyl_suppository_davis.pdf
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_7cd16d9170184752a823e8377ad5733b.pdf?index=true
    • https://s3.amazonaws.com/mogedozara/cv_template_with_photo_free_word.pdf
    • https://s3.amazonaws.com/sefiwegegagu/jowulimopa.pdf
    • https://s3.amazonaws.com/jenagubadopi/english_to_chinese_mandarin_dictionary_free.pdf
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_b478f1a200ff441cb93d8871eb57e93b.pdf?index=true
    • https://s3.amazonaws.com/wuxupewu/how_to_make_a_smoothie_with_peanut_butter_powder.pdf
    • https://s3.amazonaws.com/nefomojuwet/gangster_bengali_movie_video_song.pdf
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_59ee247ff165469f95d9a6a5821f8d99.pdf?index=true
    • https://77abcf6a-1f47-4233-a5f7-28832101be0a.filesusr.com/ugd/e29e5c_e5aa431ca8b442daa8822d2f6a1b7501.pdf?index=true
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_025c52ce2463449c85df5d60c7392ebf.pdf?index=true
    • https://291e86d0-b4b7-455e-aeca-30cd05102b29.filesusr.com/ugd/384a46_04f4d33ed7ca494ca466972d80216eea.pdf?index=true
    • http://wofuxuvo.rf.gd/62142835852.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d807.bin
806e90c89f3333eb373fb5aa71c150e0fd6e6afa42647a67bbb093520452bef0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD807 6588 bytes
font_01_sfnt_off0000e85a.bin
00907b4c64ec2e44450a68dce0d7ef82f94ec3920f9748b7b0bacd36c5ce860e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE85A 5312 bytes
font_02_sfnt_off0000fa4c.bin
7de61c64f346de095819fe1790e5c28d14f93deb2f7473c871b4b9edf974d5f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4C 9800 bytes

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