Malicious PDF — malware analysis report

Static analysis result for SHA-256 98104d634e408a90…

MALICIOUS

PDF

74.0 KB Created: 2021-03-10 01:36:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 38d1cf537a313feb8f14a3d7c8064bfe SHA-1: b152165eea2a44168f485f0b59cd7c9be7fc84d3 SHA-256: 98104d634e408a905ae04943f1ae2d45be7fa2d9905e417eb1e4e8a296629ac4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/aws?utm_term=whirlpool+top+load+washer+with+agitator+instructions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470967/normal_5fef38e80b7dc.pdfIn PDF document text
    • https://xoxisosozujuna.weebly.com/uploads/1/3/2/6/132680853/muwoxekuta_dewizejakoteg.pdfIn PDF document text
    • https://wujibinofowe.weebly.com/uploads/1/3/1/3/131383737/xunoxu.pdfIn PDF document text
    • https://jagojepenita.weebly.com/uploads/1/3/0/7/130739472/vixezakitewogogaw.pdfIn PDF document text
    • https://kevefizi.weebly.com/uploads/1/3/1/8/131871405/rozuzotida.pdfIn PDF document text
    • https://vidimepimexuja.weebly.com/uploads/1/3/4/6/134626803/kafizirima_rofibuvogavudan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426541/normal_5fd91f2825c6a.pdfIn PDF document text
    • https://gawokani.weebly.com/uploads/1/3/5/9/135993895/5661544.pdfIn PDF document text
    • https://gazotudigexeb.weebly.com/uploads/1/3/1/1/131164446/wikovenega.pdfIn PDF document text
    • https://kugavulaxux.weebly.com/uploads/1/3/4/4/134454690/semiratuz_gufobigugo_komefon.pdfIn PDF document text
    • https://pujawemufupu.weebly.com/uploads/1/3/2/6/132680931/e0f7e.pdfIn PDF document text
    • https://gemajoxow.weebly.com/uploads/1/3/4/7/134721961/6073335.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465704/normal_603e2ada54881.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445879/normal_60217f21d3355.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470972/normal_602b135e5d802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_6047f66bb275b.pdfIn PDF document text
    • https://maselevajaf.weebly.com/uploads/1/3/1/3/131398143/zefes-lirusol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sevoga/access_database_2007_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/zaderaneg.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_off0000e3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A0 5440 bytes
SHA-256: 10b9d1fcc91c96ef25e27928544c33002d9fb566866245e49916150b05a46992
font_01_sfnt_off0000f62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62D 10752 bytes
SHA-256: 0786b04e4f682e9083f369df117c02ccdc7bd1d093dca2e27be7e0af29e85fe4

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