Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf273e8ff752d9f4…

MALICIOUS

PDF

77.7 KB Created: 2021-02-25 23:58:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 70eac7b8093bda06ef5fe6bdb13041c4 SHA-1: dad582f777e2b9aebfca3c4e1fe8cb30cdcc05c7 SHA-256: cf273e8ff752d9f42fa8765eab4e9b3459d8f27697dfea3cb0e0d2ee9d598fd7
204 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable domains, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to stroller parts, likely to trick users into clicking malicious links. The presence of multiple embedded URLs and the ML classifier's high confidence score indicate a strong likelihood of malicious intent, possibly for phishing or scam operations.

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
  • 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 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.
  • 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/strik?utm_term=baby+trend+navigator+double+jogger+stroller+replacement+parts In PDF document text
    • https://static.s123-cdn-static.com/uploads/4372076/normal_5fee45d68d788.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/26509252427.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477164/normal_5fe9b54c926d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389585/normal_5fce42a98c33a.pdfIn PDF document text
    • https://fukagopesuzidad.weebly.com/uploads/1/3/1/3/131381553/cf79a.pdfIn PDF document text
    • https://cdn.sqhk.co/wusuzevomo/emqpgja/wabomematapokupidiv.pdfIn PDF document text
    • http://manovina.mypressonline.com/sat_subject_test_tutoring_online.pdfIn PDF document text
    • https://wekubobezug.weebly.com/uploads/1/3/1/3/131383536/5202310.pdfIn PDF document text
    • https://wanusasa.weebly.com/uploads/1/3/1/0/131070791/lojetepusilamorebedi.pdfIn PDF document text
    • https://zobuboralol.weebly.com/uploads/1/3/4/4/134487340/6532690.pdfIn PDF document text
    • https://jorimedazaget.weebly.com/uploads/1/3/0/7/130738946/72945d5a3.pdfIn PDF document text
    • http://jinevul.mygamesonline.org/29248609131.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446158/normal_602e20cf21e6e.pdfIn PDF document text
    • https://rilokudewagozem.weebly.com/uploads/1/3/4/5/134597993/tosizisoguwolaf-modakepunikax-gawomubax-vatixim.pdfIn PDF document text
    • https://cdn.sqhk.co/zixagiko/CoidTig/rts_in_food_processing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451231/normal_600a56e413be1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wefadep/indian_express_bitul.pdfIn PDF document text
    • http://nabenejajoko.myartsonline.com/how_to_clean_graco_swing_cover.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/moderated_mediation_report.pdfIn 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_off0000f00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 5820 bytes
SHA-256: 31d35ff675b0156a491ca4f0d7bfdf7f3cc397ff89b5e7189efd65e6f89d8c02
font_01_sfnt_off000103d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D8 10880 bytes
SHA-256: 1e87d7732c539805523ea241cf352a80389b65c1f33c2701755bb03179f9a3bf

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