Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de3afc1da5290c4…

MALICIOUS

PDF

111.6 KB Created: 2021-03-10 10:32:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ed6abda3032dc4680a407404e5aea76f SHA-1: 254f63f2b585bd1fcbde278a25eedd75e781dd15 SHA-256: 3de3afc1da5290c4a2d933dee61f7de96a5a42603ef6517e67661469bd2bb010
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to distribute malicious content or phish users. The primary malicious URL identified is https://nipisod.ru/aws?utm_term=asus+router+model+rt-n66u, which is likely used to deliver a second-stage payload or redirect to a phishing site. The presence of numerous links and the ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://nipisod.ru/aws?utm_term=asus+router+model+rt-n66u PDF link annotation
    • https://fiwedafubu.weebly.com/uploads/1/3/5/3/135345450/bujen.pdfIn PDF document text
    • https://legopaxazomunan.weebly.com/uploads/1/3/5/3/135396831/pajexovomejodos.pdfIn PDF document text
    • https://setupazaz.weebly.com/uploads/1/3/4/7/134772318/latagizenufede_fidubolupekam_guvasaluz_demusok.pdfIn PDF document text
    • http://wejowadizabudex.mypressonline.com/zetolutedinejujutudozozof.pdfIn PDF document text
    • https://rixijufufapug.weebly.com/uploads/1/3/4/4/134497528/jizuzexuruxu.pdfIn PDF document text
    • http://vizenam.medianewsonline.com/37679230650.pdfIn PDF document text
    • https://vasidigugadojo.weebly.com/uploads/1/3/0/9/130969577/zodibigepovuso.pdfIn PDF document text
    • https://xizirujikalowev.weebly.com/uploads/1/3/1/4/131454807/7f697a33706c3.pdfIn PDF document text
    • https://davugunibelerab.weebly.com/uploads/1/3/4/6/134612729/808b60832096f38.pdfIn PDF document text
    • https://vurebinavusim.weebly.com/uploads/1/3/4/7/134714178/1470055.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/702a0b3e-dc20-4314-95fe-4e4ea6d1b87c/38710184704.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1f35bed-3bdb-4a3f-8ce0-d7d9af5adf32/xusoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fe5fa70-7d5c-4cec-a126-d499a59427a1/73875064724.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5114b3a4-fde3-4942-986a-87a6f8d48442/rirolaxenovadezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/479ed6c2-e82e-47dd-9d7d-17c3b94a7899/relative_pronouns_esl_activities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6be88cbe-7908-4efb-8143-8415edb52f92/how_to_train_your_dragon_4_full_movie_in_hindi_filmyzilla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fc75e80-75b7-431c-8306-b0e503726539/fudurugomaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04a9d5ef-d2f6-40fc-b603-59877bbd45a4/tomimumujexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2350d12-b422-4548-9c4d-9b57c7092a05/72241363308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c74d1309-a6bf-4fe8-ba07-e195e01a49f6/9580459500.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000158d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158D7 4936 bytes
SHA-256: ad2c749cf1ae4bb15575fc77be480e5410c592e1e66f56b5da6470d332f715cf
font_01_sfnt_off0001698e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1698E 16232 bytes
SHA-256: fba7535fededda07c6c1106703234085e967e1ce6c5bcba8cd308f8ef938fe84
font_02_sfnt_off00019c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C1B 16108 bytes
SHA-256: 72e21c9e6e28d1fc1e954cdba925f21285186fd7fd5272e2a6f6e03af5d6fadd

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