Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89454d6e15ec8f3…

MALICIOUS

PDF

99.4 KB Created: 2021-05-29 13:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3049af116049100deb2b641c3891a69b SHA-1: 9758c01b695a4d523c19e1edc5872ede9f14a979 SHA-256: f89454d6e15ec8f3e6a845cc9d3dafd60dbbaee39cd683a4cfc06cb418e26a33
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified as a link farm. The primary URL, https://baarspo.ru/strik, is likely used to redirect users to malicious content or phishing sites. ClamAV and ML heuristics confirm the malicious nature of the PDF, classifying it as a phishing trojan.

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://baarspo.ru/strik?utm_term=dc%2527s+legends+of+tomorrow+season+1+episodes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450638/normal_602f450b87c34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369324/normal_5fcd29b4b8354.pdfIn PDF document text
    • https://golisoni.weebly.com/uploads/1/3/1/4/131437826/fifawa.pdfIn PDF document text
    • https://bikujezojodu.weebly.com/uploads/1/3/4/5/134587809/sedavuwiduku.pdfIn PDF document text
    • https://jotajawe.weebly.com/uploads/1/3/1/6/131606146/gisabu_xesiri_faravofiv.pdfIn PDF document text
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/nitowotiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471099/normal_603e7c2941db3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391319/normal_60698fb523773.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393358/normal_605b6b6a66501.pdfIn PDF document text
    • https://pugerazetowed.weebly.com/uploads/1/3/4/3/134341851/14ac0d.pdfIn PDF document text
    • https://dimafaxatabevex.weebly.com/uploads/1/3/5/9/135991177/9866478.pdfIn PDF document text
    • https://tenojamerefu.weebly.com/uploads/1/3/1/8/131857247/0f8918.pdfIn PDF document text
    • https://jivimukik.weebly.com/uploads/1/3/0/7/130775904/fuxoninavanofedex.pdfIn PDF document text
    • https://tekoxinir.weebly.com/uploads/1/3/4/6/134606092/6690842.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413361/normal_6011e4ee56e19.pdfIn PDF document text
    • https://bisomimimuj.weebly.com/uploads/1/3/4/5/134526732/feraxifapaw.pdfIn PDF document text
    • https://gewasulupav.weebly.com/uploads/1/3/0/7/130740056/7407296.pdfIn PDF document text
    • https://jawebufor.weebly.com/uploads/1/3/4/6/134647112/taxonaketagavinawe.pdfIn PDF document text
    • https://duragafadave.weebly.com/uploads/1/3/1/4/131438389/095aa924f7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000144ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144CA 5652 bytes
SHA-256: 88918f96e8373c68b855b29efee5f77e00029e2dcab3d8879fe4e959a3922b68
font_01_sfnt_off00015812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15812 12396 bytes
SHA-256: f2d9f920cddec25bccdc5ebb3c53c05effa0c65fcae1527649f4a32311364463

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