PDF malware analysis — malicious · a9e3773740171dc1

MALICIOUS

PDF

82.1 KB Created: 2021-03-20 08:36:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22

MD5: b26d891d2f1c5a90183555f436b311f7 SHA-1: eb8271964bd0b385dbc50881c6f59f1cfa16b3be SHA-256: a9e3773740171dc123062311b53911d7451a59a44bf79149b15572e03d9c5748

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to artificially inflate SEO. One of the primary external URIs, 'https://midufefew.ru/123?utm_term=radius+diameter+worksheet+pdf', is flagged as unknown reputation, suggesting a malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. While no scripts were explicitly extracted, the PDF structure and link farm indicate a likely phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9992

Heuristics 5

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.
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/123?utm_term=radius+diameter+worksheet+pdf PDF link annotation
- http://pusewuvi.medianewsonline.com/6839739705.pdfIn PDF document text
- http://pedaxofanor.mywebcommunity.org/download_amharic_spiritual_books.pdfIn PDF document text
- http://konalofasu.mywebcommunity.org/edtpa_task_2_instruction_commentary.pdfIn PDF document text
- http://tezuveripoxub.mypressonline.com/wetega.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://uploads.strikinglycdn.com/files/91afcc97-6ddb-41c5-86f2-a55ad210d5cb/mokin.pdfIn PDF document text
- https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_8e1b4604c1984994b0b368ed91787d85.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/tinezedu/1736907804.pdfIn PDF document text
- https://s3.amazonaws.com/damerirazib/roald_dahl_magic_finger_worksheets.pdfIn PDF document text
- https://s3.amazonaws.com/xugigabitulu/esc_heart_failure_guidelines_2016_slides.pdfIn PDF document text
- https://s3.amazonaws.com/figugipopar/sadigafomi.pdfIn PDF document text
- https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_31640c070e7b4a0283d52bf3a5186186.pdf?index=trueIn PDF document text
- https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_5263975a9a0a457e80935a4eeeae8555.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/fcce58a2-3eb9-462b-9471-330a09fdf098/a_different_mirror_a_history_of_multicultural_america_chapter_5_summary.pdfIn PDF document text
- https://s3.amazonaws.com/fowikorejodi/biology_answer_key_2019_gseb.pdfIn PDF document text
- https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_de52d4a9cab74d1e8a226c06cd366e05.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/feborobegibew/rizitozimu.pdfIn PDF document text
- https://s3.amazonaws.com/bepukuba/charcot_deformity_wiki.pdfIn PDF document text
- https://s3.amazonaws.com/jeworurowam/interpreting_speed_time_graphs_worksheet.pdfIn PDF document text
- https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_ed9a31e43aef4b08a0aa28b73b6fe858.pdf?index=trueIn PDF document text
- http://wawikoduvebakap.onlinewebshop.net/mixed_addition_and_subtraction_word_problems_for_grade_2.pdfIn PDF document text
- https://s3.amazonaws.com/zibenoroduzuw/gotatimivemikebexa.pdfIn PDF document text
- https://s3.amazonaws.com/lomiwexuva/bhojpuri_dance_remix_song.pdfIn PDF document text
- https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_bc9ad52ac1054455b0b7676538ed1a73.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f3f2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3F2	5188 bytes
SHA-256: `491bd9336c1eaee52ec22f82b08b3804bd51d948744a70765d2e88664ac27eb8`
`font_01_sfnt_off000105b3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105B3	11120 bytes
SHA-256: `007ef01f3ffbc7970071194915c18d168dca3fa537cca9ea26f50b8def42858c`
`font_02_sfnt_off00012b6d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B6D	4324 bytes
SHA-256: `9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2`

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