Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56c6276c588753b…

MALICIOUS

PDF

85.9 KB Created: 2021-04-23 16:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c8956aec2658d3d971ce949c07ea57ce SHA-1: 4622fa49908ef1cb9927de5c9d46681d189446f0 SHA-256: a56c6276c588753b66cfbdadb732a48404922b21fda2272b7c4afff3cf65846a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many hosted on disposable domains, indicating it functions as a link farm. One of the extracted URLs, 'https://seumenha.ru/strik?utm_term=soundcraft+ui12+app', suggests a potential phishing lure related to audio equipment. The PDF structure and link farm nature are consistent with techniques used to distribute malware or redirect users to phishing sites.

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://seumenha.ru/strik?utm_term=soundcraft+ui12+app PDF link annotation
    • https://fugokepak.weebly.com/uploads/1/3/4/8/134856046/zuwubajela.pdfIn PDF document text
    • https://tezifotunojoke.weebly.com/uploads/1/3/0/7/130776805/jewurup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388280/normal_6059c6cd65146.pdfIn PDF document text
    • https://jagewimaw.weebly.com/uploads/1/3/4/0/134012974/buwavoromusuvi_loxit_dobigop.pdfIn PDF document text
    • https://kawapojironene.weebly.com/uploads/1/3/1/6/131637385/6523786.pdfIn PDF document text
    • http://kogemotuju.getenjoyment.net/bsc_1st_year_chemistry_notes_in.pdfIn PDF document text
    • http://slimitalia.space/what_happens_if_you_take_a_nap_with_contacts_ingadlj.pdfIn PDF document text
    • https://fadusoga.weebly.com/uploads/1/3/0/7/130739873/d8dd824a26.pdfIn PDF document text
    • https://buritozube.weebly.com/uploads/1/3/0/7/130775753/wugewo_kojupirifazu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373297/normal_5fd799a977721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372399/normal_6067662a39695.pdfIn PDF document text
    • http://mesretly.xyz/jikolimemezejofilebekujthb.pdfIn PDF document text
    • https://wifevotus.weebly.com/uploads/1/3/4/8/134897576/b73d858.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/coal_briquetting_process.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_6159f5728e544d6796f3bb8a9e710cdb.pdf?index=trueIn PDF document text
    • http://xogijowag.onlinewebshop.net/bitter_almonds_book.pdfIn PDF document text
    • http://bojepudadadax.atwebpages.com/vusudomulawodo.pdfIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_8d57d48be96a4849ba29af0759a11f4a.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2A 5228 bytes
SHA-256: c5071808e4ef4345b20cf666ca62bac9a9e07c47277b543a7ecd02d65e35f3fc
font_01_sfnt_off00010d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0D 11852 bytes
SHA-256: d6090262c47b159892e3d5be043891ce02a953434238df460a88b51ca2144262
font_02_sfnt_off000134fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FA 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501