Malicious PDF — malware analysis report

Static analysis result for SHA-256 9370d7d37899ce78…

MALICIOUS

PDF

83.1 KB Created: 2021-03-05 10:43:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e411823ca168e95b4278519aaba049f5 SHA-1: 81520b8f5f9e71f0483bdc000ef19f96615008eb SHA-256: 9370d7d37899ce7835f45f80451955eb21b6bcd48a7c827bcea1077151dff8c2
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be related to search queries, reinforcing the lure to external sites. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users.

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://pelibifir.ru/strik?utm_term=holt+geometry+chapter+3+test+form+a+answers PDF link annotation
    • http://eushopvmn.site/what_is_the_meaning_of_islam_in_malayalamevtcw.pdfIn PDF document text
    • https://laludigulasi.weebly.com/uploads/1/3/1/4/131437637/fusabosita_rijiwu.pdfIn PDF document text
    • https://sakurulemiba.weebly.com/uploads/1/3/0/9/130969926/lixiwomes.pdfIn PDF document text
    • http://islandlandscapesbb.com/74175338548xenaq.pdfIn PDF document text
    • http://zzzmmmmejjj.space/c_m_g_full_forma88az.pdfIn PDF document text
    • http://verifedform.com/fexixq6vlj.pdfIn PDF document text
    • http://gufutaca3.xyz/84640419895dy3u9.pdfIn PDF document text
    • http://juilopkiretlo.ru/tanulenozazagilazilgco1n.pdfIn PDF document text
    • http://idealicaitalia-ufficiale.site/razikuzxhrh.pdfIn PDF document text
    • https://vazewelekataba.weebly.com/uploads/1/3/1/6/131606588/caa4f77d01ceb.pdfIn PDF document text
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/652813.pdfIn PDF document text
    • http://yewes.space/zebra_gk420d_free_softwarewkpjp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9404bf1-55ad-44e9-8044-47fb1aeaaaf3/34037370819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6291e038-9ad4-46ac-9015-ae5c660b249e/road_trip_movie_cast_member_dies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d96a0122-a606-42d5-a5c2-cbfd72330147/bible_study_on_let_your_light_shine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17ce6ff5-bb38-4934-9192-a7868f0141ee/gakafumeweganesafujozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6818ce62-c4ea-407b-8a03-f8cc4ef52343/dipisarepakelakewenok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1eaca08-cf27-40fe-9f4d-bb802ebcebba/mahatma_gandhi_autobiography_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ed6a023-4559-4cff-b60b-28f7ee6c8855/fallout_new_vegas_nexus_mod_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a31741d-e0b7-4c22-bf97-424a5a168c39/gk_chesterton_orthodoxy_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd410834-3732-45df-be94-ce8f55161399/what_are_some_differences_between_dogs_and_cats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9452256-35b2-46fe-b745-bf825ffe13ef/maariful_quran_english_free_download.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_off0000f95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95E 2900 bytes
SHA-256: b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df
font_01_sfnt_off000103a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A1 5748 bytes
SHA-256: 11e2d9aa965e0b2744ab788a47673b9f8edfb75286cddd63fb38c74b9eda526a
font_02_sfnt_off0001172d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172D 11488 bytes
SHA-256: 6d2ffaa4ce44879d01b3b02e5baa2642e318d4478dcf52f049092578a08c1ca1

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