Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba598c332065f5fa…

MALICIOUS

PDF

79.4 KB Created: 2021-02-17 01:05:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 362fb7332be60aa190dfe7571de8a603 SHA-1: de1cb6473c311d95f6a48d5f7006385bf16b88c6 SHA-256: ba598c332065f5fac9b2b4f43a7eb6a4d596e390d1c6fd7f0b2d62394aad4630
272 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm designed to distribute malicious content. The heuristic firings suggest it's a phishing lure, potentially related to fake invoices or callback scams, and it's flagged by ClamAV as a phishing trojan. While no scripts were explicitly extracted, the nature of the links and the ML classification strongly suggest the PDF is intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://crophysi.ru/123?utm_term=how+to+file+an+aflac+hospital+indemnity+claim+online In PDF document text
    • https://cdn.sqhk.co/fuluniziwav/bEtibjc/sifadetunoven.pdfIn PDF document text
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/loxefira.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497344/normal_601b1d672a055.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480750/normal_602115da59f6f.pdfIn PDF document text
    • https://muxojuwarerufi.weebly.com/uploads/1/3/5/3/135388895/7115542.pdfIn PDF document text
    • https://cdn.sqhk.co/zutujodara/ddKTUji/18908745456.pdfIn PDF document text
    • https://ruwatavefi.weebly.com/uploads/1/3/4/7/134704280/tegetod.pdfIn PDF document text
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/1264508.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/QuUgfFR/origami_gift_boxes_step_by_step.pdfIn PDF document text
    • https://jotinebemoti.weebly.com/uploads/1/3/4/6/134681432/sizajoz_xusifa_binexuputa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428033/normal_6003b3d278f53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448330/normal_5feaffb81dc65.pdfIn PDF document text
    • https://cdn.sqhk.co/susopavazane/ihiiBhh/95749861937.pdfIn PDF document text
    • http://reduslimitaly-official.website/3261063220oefd9.pdfIn PDF document text
    • https://tipolapuponawog.weebly.com/uploads/1/3/2/6/132696210/vabivelip.pdfIn PDF document text
    • https://mumujikik.weebly.com/uploads/1/3/4/8/134896301/3379a1d4f1452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371266/normal_6013dc3fcbb45.pdfIn PDF document text
    • https://sedogosep.weebly.com/uploads/1/3/4/4/134486754/zifofo-rakimup-tuzum.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_off0000f7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FC 5452 bytes
SHA-256: 27480ac5338e317b81fa6e1b3069383b469a6473030344b28571955ac2d08933
font_01_sfnt_off00010a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A80 10932 bytes
SHA-256: 1c4b843b8d0762b17171a74a035c0bec672b6d073838ef3603e35c95a9b42855

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