Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b6331ce85861b3…

MALICIOUS

PDF

77.1 KB Created: 2021-04-02 00:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7fdc37432d962c4d2846475469481a69 SHA-1: 5ba35199be5f65cd94715efe9ba34ece8aa62814 SHA-256: a2b6331ce85861b3ac28d8d012b33b41859b7f0b027d5cd0115cfa4c9f985cd3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://botokaw.ru/aws?utm_term=how+to+do+levene%2527s+test+spss PDF link annotation
    • https://cdn.sqhk.co/tisojubew/fGgcznl/wijakabini.pdfIn PDF document text
    • http://wamipivifubape.sportsontheweb.net/a_flowering_tree_ak_ramanujan.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/ippoMm8/28518853217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378599/normal_600d87331d359.pdfIn PDF document text
    • https://cdn.sqhk.co/sakiforivona/hhgdjgG/russian_bilingual_books.pdfIn PDF document text
    • https://cdn.sqhk.co/nozujeraguje/IBHiePw/27186116955.pdfIn PDF document text
    • http://dizurexemubegog.mygamesonline.org/2183079686.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/62892101616.pdfIn PDF document text
    • https://cdn.sqhk.co/kedetofido/6Ujghhd/99738653831.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472774/normal_60663dd29fc91.pdfIn PDF document text
    • http://tesekal.mygamesonline.org/12838169778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382208/normal_5fd283c4c3ec7.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://s3.amazonaws.com/sasufufa/30450376825.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1ef3264-633c-4b6a-99e1-61f0e770348e/97595706125.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/59673521386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/486b48fd-dd4f-433d-a5ab-26de08953273/how_to_study_chemistry_for_class_12_boards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/250d3907-4454-4b2a-b6c9-fcd12e0a2a48/how_to_sync_wd_my_cloud.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/python_3._6._3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/082cf40e-c8fa-42a2-af2f-b89fd098caca/vevidavobezawoledero.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_off0000e352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE352 4536 bytes
SHA-256: 673f63ad903836c54182a9fcb6396f7d57eb3552d53763efb0d8d9172fc63d78
font_01_sfnt_off0000f2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E8 11192 bytes
SHA-256: 2768a3e30e4a54a6ce6496416554bddb4bdf10e803374b126292a25b1ade0fd8
font_02_sfnt_off00011944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11944 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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