Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d822e87eeca2c6…

MALICIOUS

PDF

105.5 KB Created: 2021-03-21 12:19:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6b8a7ab3491c2b2af84c10120b44b52f SHA-1: 344969f82c069cc58741a7aa4c03803abe6cc30e SHA-256: e6d822e87eeca2c693156089eb8d92a965550b72b9398b5d600f4dd62cd59568
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'how to setup dlink dir-655' and is associated with a high ML classifier score and ClamAV detection for phishing and trojan activity. The presence of embedded URLs and the nature of the link farm indicate an attempt to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/strik?utm_term=how+to+setup+dlink+dir-655 PDF link annotation
    • https://dipalowijoje.weebly.com/uploads/1/3/0/9/130969855/vakok.pdfIn PDF document text
    • https://wamonudikiso.weebly.com/uploads/1/3/0/7/130776885/6722840.pdfIn PDF document text
    • https://zoguripan.weebly.com/uploads/1/3/1/0/131070442/53b95ab8b49d.pdfIn PDF document text
    • https://wojujasomiselok.weebly.com/uploads/1/3/4/4/134487215/zudolebepuvigax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402712/normal_60367df02da37.pdfIn PDF document text
    • https://kokazokurazafan.weebly.com/uploads/1/3/5/3/135348127/67e01631da443.pdfIn PDF document text
    • https://lupolaluxu.weebly.com/uploads/1/3/2/6/132681144/dipek.pdfIn PDF document text
    • https://simokodopegaliw.weebly.com/uploads/1/3/0/7/130776428/b7f51486ea.pdfIn PDF document text
    • https://xadamunakufadi.weebly.com/uploads/1/3/3/9/133986396/86d62931c811.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469143/normal_5fc5bdd5acf90.pdfIn PDF document text
    • https://xadigepuve.weebly.com/uploads/1/3/1/4/131454317/pevigesatusikuvivew.pdfIn PDF document text
    • https://sefatepasegul.weebly.com/uploads/1/3/0/7/130775173/vifif.pdfIn PDF document text
    • https://talekadibozevo.weebly.com/uploads/1/3/5/3/135393667/keduparoxava.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465000/normal_60362b7477ccb.pdfIn PDF document text
    • http://appletopshop.ru/tamil_advertisement_mp4_videohqgfy.pdfIn PDF document text
    • http://prechambre.xyz/la_la_land_epilogue_piano_sheet_music_free0ct5p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463300/normal_5fd829ea02804.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_dfab204c36404493b69fdde6b0f1d459.pdf?index=trueIn PDF document text
    • https://d6ac5066-27fc-4e71-a07d-b30af50dfe8b.filesusr.com/ugd/934fc3_f431764293804161910b39fe64be9820.pdf?index=trueIn PDF document text
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_54382e8aaaf7457fb399d3a85ce02533.pdf?index=trueIn PDF document text
    • https://ad060920-74d0-4a59-a46a-f478898ed72a.filesusr.com/ugd/a7c1e6_7114787e3966490ea913b69adf12e79f.pdf?index=trueIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_771ab288d03b4cf39cdad142b33f9d8d.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_off00015b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B7E 5172 bytes
SHA-256: 71353e401c12b9d32c77793fe08517f49288cf59386086f827e3ad3db2b9b6ef
font_01_sfnt_off00016d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D3E 12976 bytes
SHA-256: 58e994bf2f461e2ec427672cf12ee25043f092eb5dc8370f20e1d788d2c9b87f