Malicious PDF — malware analysis report

Static analysis result for SHA-256 89abe70dc3ad52a4…

MALICIOUS

PDF

76.4 KB Created: 2021-02-17 17:17:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b05fde8403003ed289e954a7acbe3303 SHA-1: d367e0e20457ba843564c8b29a6e6b76267f4a49 SHA-256: 89abe70dc3ad52a430148695b5641040acca55d5f7e5c769b57f1eeb11a6cc2a
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. This behavior is often used to manipulate search engine rankings or to distribute malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://bologen.ru/strik?utm_term=2017+ashrae+handbook+fundamentals+si.pdf In PDF document text
    • https://rovetizewi.weebly.com/uploads/1/3/0/7/130776299/2413620.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393346/normal_5feee36c4c6d8.pdfIn PDF document text
    • https://perasukene.weebly.com/uploads/1/3/4/6/134644841/6ab74.pdfIn PDF document text
    • https://dolepaxutafajur.weebly.com/uploads/1/3/0/9/130969408/gitinetufoferewevi.pdfIn PDF document text
    • https://sutowuvo.weebly.com/uploads/1/3/4/6/134685384/divuxowuparataf.pdfIn PDF document text
    • https://dumuzuvo.weebly.com/uploads/1/3/4/6/134695275/445249.pdfIn PDF document text
    • https://bimipesetasezi.weebly.com/uploads/1/3/4/0/134017520/padakofikutudeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475582/normal_5fe7ef49de20e.pdfIn PDF document text
    • https://koximewi.weebly.com/uploads/1/3/0/7/130775363/8499770.pdfIn PDF document text
    • https://xojutezakiveze.weebly.com/uploads/1/3/5/3/135318362/e5f2820ce5.pdfIn PDF document text
    • https://lifitexuga.weebly.com/uploads/1/3/4/3/134356919/mekudogawon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gogewarixisude.epizy.com/pipuguvavinekaja.pdfIn PDF document text
    • http://gitogopafo.epizy.com/doxuxanurawewa.pdfIn PDF document text
    • http://zuwosopawekaz.rf.gd/present_progressive_verbs_worksheet.pdfIn PDF document text
    • http://bapibalapu.rf.gd/tenuma.pdfIn PDF document text
    • http://fobifuv.epizy.com/toxoxobiluzisukavibuzupij.pdfIn PDF document text
    • http://dilizefolu.rf.gd/abstinencia_definicion.pdfIn PDF document text
    • http://gowejolu.rf.gd/dreamweaver_cc_2019_tutorial.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_off0000ec9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9E 5828 bytes
SHA-256: b59646fc3fe2f28b0a84dae7fdaf39931796fd9e4a4831779d311198d2419f9d
font_01_sfnt_off0001004c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004C 10388 bytes
SHA-256: 168ecbc1505f0cb927cc734cadd74c3d5ed53c10fba909e4561da42a4611d8b5

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