Malicious PDF — malware analysis report

Static analysis result for SHA-256 502b626c993a2d9d…

MALICIOUS

PDF

86.6 KB Created: 2021-03-06 18:06:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b9548e49a46dc4f400002880bc9f3ca6 SHA-1: d34153bca980a4d52f471801b7edb7f4782d1f23 SHA-256: 502b626c993a2d9d6dd122f918577c3fb7235116e75e16911bd56cf04ed44571
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm or phishing lure, directing users to potentially harmful websites like jumiwimov.ru. The presence of embedded JavaScript, though not fully analyzed, further supports the malicious classification by enabling dynamic content and redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jumiwimov.ru/aws?utm_term=you+have+the+right+to+remain+innocent+summary PDF link annotation
    • https://jejepijukutu.weebly.com/uploads/1/3/4/1/134131362/a4d0b4080a.pdfIn PDF document text
    • https://nusimilanagazi.weebly.com/uploads/1/3/1/4/131454102/mixilaw-nopasano-bejilipufemin-numukanid.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/fmiiqW4/moxewibuzapaxokaxiwa.pdfIn PDF document text
    • https://tekeginisexufu.weebly.com/uploads/1/3/1/3/131381150/c4891204.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367627/normal_5fe7da4bed8cf.pdfIn PDF document text
    • https://bibawegosisuzu.weebly.com/uploads/1/3/5/9/135961680/1839502.pdfIn PDF document text
    • https://cdn.sqhk.co/zedazisem/dlgi3ia/dinid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444353/normal_600bb0fc838e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419452/normal_60060f8027a4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470692/normal_6025219034234.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416660/normal_600fdea530de5.pdfIn PDF document text
    • https://tipolapuponawog.weebly.com/uploads/1/3/2/6/132696210/nunijuxiwaja-sapawise-lezurulodit-kubigazude.pdfIn PDF document text
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/bea43703807.pdfIn PDF document text
    • https://bapadiwifujeki.weebly.com/uploads/1/3/4/0/134041393/gibofenapanuvukos.pdfIn PDF document text
    • https://cdn.sqhk.co/sabepakofo/hdhb8V0/narisuvedoxexu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://786c536d-253b-4a15-94df-129c4693a223.filesusr.com/ugd/1fc311_5e04a169f77841039644c3f0b2947509.pdf?index=trueIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_d8395d5e50ee477eba175ab799134b1e.pdf?index=trueIn PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_6a34501a76d144318f99f591e8ca0dd7.pdf?index=trueIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_8d1308087e504301af2ecc29d9ecfd8a.pdf?index=trueIn PDF document text
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_a71726db07dc4415a207e4b77e3a9447.pdf?index=trueIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_23246802b08a470a83ab327a6de7abb4.pdf?index=trueIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_3e13627febab463599a554e904ece280.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
    • 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_off00010027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10027 5304 bytes
SHA-256: cd2fc9a2fb93d750c512de51d399fac18628e655986293f18f17c951b482e304
font_01_sfnt_off0001121c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121C 11248 bytes
SHA-256: 813a9c6f92e9186d078e80d4c1a8a38620194b325b47079514aeb7059b46b51b
font_02_sfnt_off000137c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C1 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330