Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef79df18d815742f…

MALICIOUS

PDF

76.8 KB Created: 2021-04-18 03:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d57428befd4fc2f3c8eea3be18691c57 SHA-1: 120a6bf436c5425aceb705ab020287dd08f04296 SHA-256: ef79df18d815742f7aab74f49fa19d5a47383602d6227362ab5ac1415ba4dcc7
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, indicating a link farm designed to distribute content or redirect users. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/strik?utm_term=can+i+jailbreak+apple+tv+3rd+generation
    • https://fitisasituwag.weebly.com/uploads/1/3/4/8/134846324/33080db6204f.pdf
    • https://wigawiwamenusum.weebly.com/uploads/1/3/5/3/135323889/676ff64.pdf
    • https://warasogufav.weebly.com/uploads/1/3/4/4/134440103/3868e09999d.pdf
    • https://static.s123-cdn-static.com/uploads/4374839/normal_5fcf4f0519f0c.pdf
    • https://cdn-cms.f-static.net/uploads/4447466/normal_5fd6367fae711.pdf
    • https://static.s123-cdn-static.com/uploads/4365598/normal_6004d8df4fcb5.pdf
    • https://lolejubabam.weebly.com/uploads/1/3/1/3/131379737/zuxaxilolimopigedigi.pdf
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/9338034.pdf
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/zexados-wuluwikol-gajabugawizix.pdf
    • https://lezekuzog.weebly.com/uploads/1/3/1/3/131378913/7855897.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mawunodopijosa.epizy.com/36886939210.pdf
    • https://uploads.strikinglycdn.com/files/060c0bde-ffcb-4491-b602-5d485af5b527/66206747632.pdf
    • http://vegozamefokim.rf.gd/halloween_coloring_by_number_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/79530fd6-fd3a-4852-bd03-887604332088/93544730033.pdf
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_5f2a722a87894f748cd05ee02c5771e9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/29cc0dde-ba38-4269-9ef5-a259054b0b2d/hamilton_beach_retractable_cord_iron_model_14881.pdf
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_eb016d7b316c48229398a6c802b64da3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7ccc545e-a330-41e8-941c-e942f87a228a/31536325511.pdf
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_24c15c10b31c454dab5459caea593350.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fb167c87-709e-4006-a6b5-d95cbf82d057/dell_latitude_e6510_core_i7_price_in_india.pdf
    • 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_off0000ec07.bin
c5875acfc42e273c2cab4ff42a96880177e44425af62dca7266ffca27f995223		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC07 5360 bytes
font_01_sfnt_off0000fe53.bin
0bf4b7701b427a8aaecfec82908c1a7ea866f7ce49b0edfc05e10bc125a63d37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE53 11580 bytes

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