Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d361c06a0dc0ba…

MALICIOUS

PDF

82.5 KB Created: 2021-03-10 08:39:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 03423555235b556061d3aa0deb3b8c0d SHA-1: f42d5711590e9e8272ee3b131790bf2414c114b4 SHA-256: 86d361c06a0dc0ba8d7281c726d1985aff2d0ad7052e26a8ef4d30e7776b7d7b
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, indicating a high likelihood of malicious intent. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure (dafemum.ru). The presence of a link farm suggests an attempt to manipulate search engine results or distribute content through numerous external sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dafemum.ru/wix?keyword=where+can+i+buy+prosolution+gel In PDF document text
    • http://zesaguzijor.mypressonline.com/lirumomupinijurekimelitub.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/how_to_make_a_flapping_paper_crane.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_34fc2782aab3498bb9d271dcfd0697a1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuxexi/79778138110.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/payoneer_money_adder_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/lulup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3e14ab2-fd0f-4c31-819a-a5fd59a07863/judutagujineferufuba.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/zutidosa.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/coronary_artery_disease_prevention_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cecd7fb-71f4-4c24-b213-02899c77be2e/77816517882.pdfIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_0220ce961c0648389608c5da3a3666e2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ginutu/4_and_6_figure_grid_references_worksheet.pdfIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_a4153c180b0145e28f9a98dd9d7e72c1.pdf?index=trueIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_93816e277a154b8ba0540a5bf19e01fb.pdf?index=trueIn PDF document text
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_579270a0157d40e7bdd8c0b4fb3d9501.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zizene/bakery_menu.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/velokusigeviluxer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae0093ad-17f8-4cac-b75d-e44b06638bf6/what_levels_does_first_response_detect.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/marigever.pdfIn PDF document text
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_65da60f8660d4e8bbd7852dbaa1ecde0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52e0d004-bc9b-4e1b-acc9-337deeede63c/data_warehousing_concepts_techniques_products_and_applications_by_c.s.r._prabhu.pdfIn PDF document text
    • http://pojoviraxerojo.myartsonline.com/ariens_rocket_vii_tiller_engine_replacement.pdfIn PDF document text
    • http://rugoxesoteko.myartsonline.com/devi_atharvashirsha.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7193a42-d5c3-49db-9c80-024b049b4384/54556948778.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/tv_guide_game_of_thrones_episode_ranking.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 5332 bytes
SHA-256: 55c068c5364285b9b798eb267653c396830ce891430da1b178d8a54f977f38cd
font_01_sfnt_off000108fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FA 11068 bytes
SHA-256: 2fb0ce5641265f2201fb834630430025652815081a9600b61d9d1df914d3d97d
font_02_sfnt_off00012e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E43 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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