Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28edae973ae53d8…

MALICIOUS

PDF

153.4 KB Created: 2021-03-28 01:05:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0033c18ff994323ece117ff81d37b3ce SHA-1: 1014656df8c60f28525f7bb6874f7cc74ee46e13 SHA-256: f28edae973ae53d81d47c20f408e00e4dbfdf6206ce63f8b377a00fbfe9ebd90
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 0.9989

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://dafemum.ru/123?utm_term=jboss+eap+7.+2+migration+guide PDF link annotation
    • http://familyit.pro/test_data_management_jobs_in_punelq82y.pdfIn PDF document text
    • http://ru-en.xyz/marojuvezigulukazew9z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412894/normal_605c728a6516c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369774/normal_5fe0658acca1c.pdfIn PDF document text
    • http://rirelavemug.iblogger.org/87213236432.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477916/normal_605fb7866da87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379486/normal_601b45e32d492.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/satulibaren/79618982577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/867f6e05-a804-4e21-bc1d-1d9a7bfc8f1d/xovitawadogaxanaxaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7019e49-79de-4526-9320-8516867a90b9/95268580659.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/antivirus_android_apk_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a855d7d-b665-4cf9-8347-527f3ed38214/what_is_sequential_writing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a906fee-d589-487a-be98-e55a87f5af99/minecraft_mushroom_island_seed_ps4.pdfIn PDF document text
    • http://sakikuzugodo.rf.gd/pedubudepuvebimivewepal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8c72018-7f8f-4639-a6ee-af475d40ed45/what_is_the_newest_ipad_mini_model.pdfIn PDF document text
    • http://turijebudeta.rf.gd/khoc_len_cardigan_form_di.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/julifumev.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/xobebaxiluwabowokibapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/149f807b-5e10-4119-9cd2-d3da9ef02b25/how_many_carbs_in_one_subway_sugar_cookie.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/free_quilted_bag_patterns.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F6DD 5504 bytes
SHA-256: e7a06c4f9cff3c45d74302b49e805e2bce5fb55f13219ca3e35f23e8a3a951a2
font_01_sfnt_off00020974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20974 13092 bytes
SHA-256: ddbbb94bdfe1225e5f826778fc50115285ea225b648d500a6810135bef9f99d7
font_02_sfnt_off000234c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x234C0 16096 bytes
SHA-256: 9853a4a918762215dfcba51349555ff48d39e56332efe18e2f333ca30d8a5b61
font_03_sfnt_off0002498a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2498A 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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