Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5200c03cac9aab…

MALICIOUS

PDF

81.1 KB Created: 2021-04-03 20:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 68563b4ad23668c921a10d83ad4d156b SHA-1: 0853bd7a71a47bf904bd092a63f458566f3cdb30 SHA-256: 9c5200c03cac9aab39bfaad9c51f9ee0667727b921c4c30373f2ecce1bc13783
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a significant number of which point to disposable hosting and appear to be part of a link farm. The primary URL, 'https://midufefew.ru/wix?keyword=sentence+correction+worksheets', suggests a lure related to educational content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/wix?keyword=sentence+correction+worksheets PDF link annotation
    • https://nububoreral.weebly.com/uploads/1/3/4/4/134467099/7f0bbcf051938a.pdfIn PDF document text
    • https://xubibedizu.weebly.com/uploads/1/3/1/4/131454459/kadixel.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://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_657aa2e18afd4b9da3afd3fa8d375daf.pdf?index=trueIn PDF document text
    • https://6448a590-b571-4b71-a9e4-820b8531b153.filesusr.com/ugd/782be2_c9027897b21344b7af166f8381fae249.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/82442056914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c050db12-2092-402d-a5b5-9c85eb18341a/what_are_the_8_figurative_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c519a10c-0b0e-4a01-b160-ab88058b537a/what_were_the_main_points_of_the_95_theses.pdfIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_898b0006de484a71bf2ca9ffea5b4427.pdf?index=trueIn PDF document text
    • https://10bc5e17-7652-4c7e-9b43-999b3eb3b021.filesusr.com/ugd/5edc69_34767da36d484e12afa61146bbe2121d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/fumimerag.pdfIn PDF document text
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_85c1cbd0e5fa4cf599e5e73bc43f58a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/70ef1e27-2ef6-4f94-a23a-eb3521edf7f0/zezitimigogowidatisuzam.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/decimal_place_value_chart_up_to_thousandths.pdfIn PDF document text
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_64ca1b3ff5cb4ba4a36cf3e9d635893c.pdf?index=trueIn PDF document text
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_25c07deeb6f84cf7aa8ab8dd169961e4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/vameragekaxag.pdfIn PDF document text
    • https://0eaabcdb-938a-45a6-85a3-1a7d796bbcdd.filesusr.com/ugd/8d6d25_255a4fa181834af5adb3bf3211819841.pdf?index=trueIn PDF document text
    • https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_710ecd869b12413a96297c4152a30cc2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/32d76e01-24c9-40a4-be7e-09bcc012feba/night_owl_hd_4_camera_review.pdfIn PDF document text
    • https://3c8d80e7-2998-4b53-b1db-ea2053e4eee2.filesusr.com/ugd/5c8c55_7cb8c9ca86e047a8a8bc4069e6ed6d67.pdf?index=trueIn PDF document text
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_bae9ddd26701469d8e4c25bfc64b0e07.pdf?index=trueIn PDF document text
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_578dbf567af24a7d87f6614fdee56e8d.pdf?index=trueIn 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_off0000f491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF491 4692 bytes
SHA-256: 911b1b2293e588dd8f1819b894b491d9916ba397b675cdfdcf80d66887b5779f
font_01_sfnt_off0001047f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047F 10516 bytes
SHA-256: 3bc2d215c3b4b9291bcfc896248897650ac7804cfaabb3402d957e57adbb4c96
font_02_sfnt_off0001288d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288D 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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