Malicious PDF — malware analysis report

Static analysis result for SHA-256 709e85eb722336a4…

MALICIOUS

PDF

97.1 KB Created: 2021-05-31 13:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d3a62fe97983a7dc0a292360276319b5 SHA-1: 94f85dcc8806c4f3074205bd8fca8057484e0b85 SHA-256: 709e85eb722336a4eada8b4783eb85ed854f7b28a0c81a5d2489d29f6eff2aa1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, appears to be related to checking EBT card balances, a common lure for phishing or malware. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=how+can+i+check+my+p+ebt+card+balance+online PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465548/normal_5fe2bdab7387e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416923/normal_5fd33a77f047c.pdfIn PDF document text
    • https://ximofutaxa.weebly.com/uploads/1/3/4/6/134626718/14807c39c5aec53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402720/normal_5ff8b644a0a28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373248/normal_5fe778a901e46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416792/normal_5fefa4e9636f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471114/normal_6005bc363fc89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482190/normal_6017f6be10ce5.pdfIn PDF document text
    • https://rigugoxa.weebly.com/uploads/1/3/0/7/130776225/5823142.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449793/normal_6032558ec312a.pdfIn PDF document text
    • https://fawesilabe.weebly.com/uploads/1/3/2/6/132680990/xalotaguj.pdfIn PDF document text
    • https://jetorijeroxu.weebly.com/uploads/1/3/4/6/134693882/9974969.pdfIn PDF document text
    • https://dipediras.weebly.com/uploads/1/3/0/7/130739778/bolalukufozada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406228/normal_605f4806609b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_604ca34a84381.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456387/normal_60449f9f56a4b.pdfIn PDF document text
    • https://gopiwalugase.weebly.com/uploads/1/3/0/7/130738825/06ac6.pdfIn PDF document text
    • https://tasakexer.weebly.com/uploads/1/3/4/6/134669330/c784db9.pdfIn PDF document text
    • https://lunisaga.weebly.com/uploads/1/3/5/3/135302545/zabakul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459788/normal_604b4dcf67cd5.pdfIn PDF document text
    • https://gifawinap.weebly.com/uploads/1/3/4/3/134386913/bf98ea6.pdfIn PDF document text
    • https://mopobaseburole.weebly.com/uploads/1/3/4/8/134859053/72c36.pdfIn PDF document text
    • https://kukegogefip.weebly.com/uploads/1/3/2/6/132681459/46e43900826bc42.pdfIn PDF document text
    • https://bizizavo.weebly.com/uploads/1/3/7/5/137502277/6916482.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389354/normal_604b268a1e4b0.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_off00013d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4E 5496 bytes
SHA-256: 681d85c508134b307afef3dcd6f664c3e6132022494ab89bf7e507a767b7afc1
font_01_sfnt_off00014fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE3 11448 bytes
SHA-256: 03369e194f7c26981ab1a33b1bc42fca1664c076bdec36bce42c362f8275311a

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