Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1547eaea23eb05c…

MALICIOUS

PDF

73.4 KB Created: 2021-04-06 08:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 90821875695b780effcdc8909519a61f SHA-1: 90e42e003ba073755d540c7ba3f1fae1d0e5b927 SHA-256: e1547eaea23eb05c03ea03659f1a18a09ceaa301e404b79c9c28e1dbd7410867
186 Risk Score

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-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://bologen.ru/strik?utm_term=enfermedades+del+sistema+endocrino+y+su+prevencion PDF link annotation
    • https://cdn.sqhk.co/pujazojiwixi/fEsKB6k/battle_angel_alita_last_order_characters.pdfIn PDF document text
    • https://cdn.sqhk.co/jarogofef/hd53AuD/uga_football_memes_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/lexijunibul/aZggQjj/minecraft_lucky_block_skyblock_map_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xijisejes/idigjhd/wovax.pdfIn PDF document text
    • https://cdn.sqhk.co/gobenebovi/Hjig6ic/surviv._io_wiki_weapons.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/WKA1oJR/roof_it_right_orange_park_reviews.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nemunuj.rf.gd/92701434611.pdfIn PDF document text
    • http://gozudivigel.epizy.com/moradezipavoloxodufog.pdfIn PDF document text
    • https://beb587af-1766-4a1c-893d-8c04a9882fa7.filesusr.com/ugd/f3bec4_16b46f34b8c0492c990c930b2dee3a7b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/niporofez/kuxadu.pdfIn PDF document text
    • http://lejopuluke.rf.gd/76889729898.pdfIn PDF document text
    • http://fuwenepuxudamu.epizy.com/nazosu.pdfIn PDF document text
    • https://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_5bf72074ca474ff697845324e765e142.pdf?index=trueIn PDF document text
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_58b794e0e94145cb94a390d1d11d726d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jipowumat/critical_thinking_basic_questions_and_answers.pdfIn PDF document text
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_ff8288b982ae47f4820092d849480774.pdf?index=trueIn PDF document text
    • https://8e6fe9cb-6e01-49b8-a8bf-add1d7538daa.filesusr.com/ugd/4e948c_ae8cc34091c345568e155fc3b21667dd.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA1 5420 bytes
SHA-256: 76afd490ece2e044511b5b262d71372443fc0e8c2f3bb0b54e995bca751a94bc
font_01_sfnt_off0000f00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 11840 bytes
SHA-256: 0374015add74e1a35a084e4a119fd3701aec4867d5906dd31dd7af406f8dd1ed

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