Malicious PDF — malware analysis report

Static analysis result for SHA-256 9551eb4d973237d6…

MALICIOUS

PDF

82.6 KB Created: 2021-03-28 08:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb545023ec19970bc6a326f4846f539c SHA-1: 84e85e8ca643e6a74a46d6d24e3a953ace6df2af SHA-256: 9551eb4d973237d671658cb29d1aeab7ff1c2c157879db4400a3fbb5d76dd4f6
224 Risk Score

Malware Insights

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

The PDF document contains lures related to advance-fee scams and callback phishing, suggesting a fraudulent intent. It embeds external links, with one pointing to a suspicious domain 'midufefew.ru', likely serving as a landing page for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://midufefew.ru/strik?utm_term=how+to+get+a+daycare+voucher+in+md
    • https://cdn.sqhk.co/fipimomozuk/ggjAdja/amazon_seller_central_europe_help.pdf
    • https://cdn.sqhk.co/gukokefa/Hjbdrid/zombienoid_brick_breakers.pdf
    • https://cdn-cms.f-static.net/uploads/4384154/normal_6011111553b54.pdf
    • https://cdn-cms.f-static.net/uploads/4390068/normal_6043ff9ebeee3.pdf
    • https://static.s123-cdn-static.com/uploads/4455195/normal_5fcc097ca88be.pdf
    • https://cdn.sqhk.co/pigajifaw/iDYhigj/60736659036.pdf
    • https://cdn-cms.f-static.net/uploads/4366311/normal_604dbf82bf629.pdf
    • https://cdn-cms.f-static.net/uploads/4377414/normal_6037264f7dd42.pdf
    • https://cdn-cms.f-static.net/uploads/4426421/normal_6022296628846.pdf
    • https://cdn.sqhk.co/duwenaxiseve/171WijI/25812390526.pdf
    • https://cdn-cms.f-static.net/uploads/4368781/normal_6010a96806d1a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/68329758-23c5-4308-a365-d881d0ca4ad3/maxafokibimopino.pdf
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_883a7368291a447bb7739bcb0afb6522.pdf?index=true
    • https://baad1762-ad72-434c-be9a-9de7d8068d01.filesusr.com/ugd/61395f_d664ee846b934c499524b840ce84f5ee.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8ae67279-1724-48a9-a93a-1d4037fbe6ff/63295921074.pdf
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_a1fb87c4ca6a44879034d0c19d0aa633.pdf?index=true
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_2c639bdf295d4ed4a41c2e9ed7fe4d66.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102de.bin
4f777e3f6b8cf344627c41a2d413812556321569fb09feceb1ca8c5143a770db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102DE 5360 bytes
font_01_sfnt_off0001150d.bin
9be2cc27185c4f80695026d1c88f97909e532cb91fff49734568386714123f86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1150D 11996 bytes

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