Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e913319115b7ba…

MALICIOUS

PDF

81.0 KB Created: 2021-03-18 01:59:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 05df21e4ca83488bf7b07ac70b952f7c SHA-1: bdf98ff62175c9490ed9d6edd3e24136d560921b SHA-256: a9e913319115b7bab346af2492fda36eca2b1b9efb5ba1f22f6ee2cd51938c3f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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.
  • 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/strik?utm_term=why+is+my+newsfeed+on+facebook+not+updating+on+iphone PDF link annotation
    • http://shtancircul.site/99323121655ykwoe.pdfIn PDF document text
    • http://salestore.pro/capstone_project_ideas_nursingft0td.pdfIn PDF document text
    • http://dkblogin-de.com/1019566349ewes0.pdfIn PDF document text
    • http://ruxuzosok.mywebcommunity.org/christian_pre_marriage_counseling_books.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427105/normal_600b5efc3e6fe.pdfIn PDF document text
    • http://terugate.mypressonline.com/trolls_just_cant_stop_the_feeling.pdfIn PDF document text
    • https://lilepixot.weebly.com/uploads/1/3/4/4/134462463/jekexosiza.pdfIn PDF document text
    • https://sazunanu.weebly.com/uploads/1/3/4/5/134596286/5943a54a1b0.pdfIn PDF document text
    • http://kobodesuwid.getenjoyment.net/maze_runner_characters_personality_types.pdfIn PDF document text
    • https://mimasalidapu.weebly.com/uploads/1/3/4/4/134466186/079abd8c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401694/normal_5fdad96b1b515.pdfIn PDF document text
    • http://grusha.space/td_auto_finance_missed_payment8obkw.pdfIn PDF document text
    • https://poxaneduwi.weebly.com/uploads/1/3/4/2/134234601/dipavafe.pdfIn PDF document text
    • http://firstdoctor.xyz/destination_imagination_instant_challenges_iowavai1s.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://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_e5d118233bd349beb95b9f90ef8e51aa.pdf?index=trueIn PDF document text
    • https://1fae3a98-13b7-4b95-b1f0-1fbd1b7b0aee.filesusr.com/ugd/1da05d_800d55bcc1db4a8b9591ea8ae7cc3225.pdf?index=trueIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_9850c2277b0d4fd38c6e1e969831dabe.pdf?index=trueIn PDF document text
    • https://c2963e02-5f2a-49ff-bb4d-22715b80ab3a.filesusr.com/ugd/55efe4_90b300caa08b49839db749451eae47ee.pdf?index=trueIn PDF document text
    • http://kavuduvolilazod.myartsonline.com/agananooru_book.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_off0000ef27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF27 5736 bytes
SHA-256: e2747185be3c6bc3528db96181bc30bdc56247d90c60b68c9217e643f7dd87ff
font_01_sfnt_off000102a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A4 10492 bytes
SHA-256: f75b2f9e1a92b365aa5a027a83271ed5c0dc9a6ace1465c927eaf7a4bdd6e6c6
font_02_sfnt_off00012676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12676 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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