Malicious PDF — malware analysis report

Static analysis result for SHA-256 715bae1f1177478b…

MALICIOUS

PDF

81.6 KB Created: 2021-03-16 03:03:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: bbf84d685837029e3a63628d8203db3c SHA-1: d9b4ba826a9065e3569a22be26827eafe42e24c7 SHA-256: 715bae1f1177478b5cddb0dc412cf2121055837d50fb09dc827db15814df9a3f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting and are likely part of a link farm designed to distribute malware or facilitate phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://kuzutuzo.ru/wix?keyword=monsters+inc+genetics+worksheet+answers PDF link annotation
    • http://gonunimob.iblogger.org/1364232162.pdfIn PDF document text
    • https://tabutepapuwup.weebly.com/uploads/1/3/0/7/130740025/biwudo.pdfIn PDF document text
    • http://vomidujoma.scienceontheweb.net/what_is_the_purpose_of_the_bevel_on_a_needle_tip.pdfIn PDF document text
    • https://gulikefesagigal.weebly.com/uploads/1/3/5/3/135303577/99707a2.pdfIn PDF document text
    • https://repewagisax.weebly.com/uploads/1/3/5/3/135319399/0741556c629.pdfIn PDF document text
    • https://vufemare.weebly.com/uploads/1/3/4/8/134855896/0945045616024.pdfIn PDF document text
    • http://mekuwomusaxonod.22web.org/wirosifelatiraninujub.pdfIn PDF document text
    • http://rugegav.mywebcommunity.org/56884282070.pdfIn PDF document text
    • https://luzijegeze.weebly.com/uploads/1/3/4/0/134040843/7749213.pdfIn PDF document text
    • https://jepibuko.weebly.com/uploads/1/3/0/7/130739686/92dfc3.pdfIn PDF document text
    • https://zumasugi.weebly.com/uploads/1/3/4/8/134864891/dadagelunagopa.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/8th_grade_vocabulary_list.pdfIn PDF document text
    • https://nitaluba.weebly.com/uploads/1/3/4/3/134348735/kebejin.pdfIn PDF document text
    • https://nutomejeti.weebly.com/uploads/1/3/4/7/134702699/e3cc0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kusuganuxe.epizy.com/nutaturumegejaseg.pdfIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_aeca3788bbeb4c8693d70828ea0d9ce0.pdf?index=trueIn PDF document text
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_adda08611e7846389cce5a919322325e.pdf?index=trueIn PDF document text
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_8b226b6c913c41229bb140e166801d86.pdf?index=trueIn PDF document text
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_19b4775f643e4e799e585d02184cc128.pdf?index=trueIn PDF document text
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_8573bad8bad1438eb3f73b0c4eaabc84.pdf?index=trueIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_1cea71c98bfc435c8b116d43e7163ffa.pdf?index=trueIn PDF document text
    • https://bea00909-aa88-4d38-ac88-e56db460b486.filesusr.com/ugd/923104_23f6b1eae0ed486f8cc919453cb42df2.pdf?index=trueIn PDF document text
    • http://sivumokevidosib.rf.gd/assamese_dj_song_2019_asomi._in.pdfIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_e0984d7657cd4f49988c20e5443f196c.pdf?index=trueIn PDF document text
    • https://f3dcd8e3-6656-4b47-a81e-a993d3c4f2a1.filesusr.com/ugd/aa9ef2_0e67b3ebf078403b81d432c680f50211.pdf?index=trueIn 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_off0000fee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE2 5192 bytes
SHA-256: f69420274717610a49d427fa0ff2a3fea420a4bf292f1b988ee6e3d31fc3e4bb
font_01_sfnt_off000110a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A6 11688 bytes
SHA-256: 101a52e82022fc8bc13394696b34d240a7ee24aa1bc69c763996c7e23fbd10b1

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