Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59584a7db166ae0…

MALICIOUS

PDF

73.7 KB Created: 2021-04-05 11:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5562f57a7ae529b511b2b6528b6f42ae SHA-1: 3ea5ccfa6742121455d959c9058f9016acb80b15 SHA-256: e59584a7db166ae0ce121f854e0321fe5818d4601b528b9b12cff9ef81dd1a33
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified numerous external URIs, many hosted on disposable domains, suggesting a link farm or distribution point for malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Apa citation rules pdf', indicating a lure to disguise the malicious nature of the links. No scripts were extracted, but the presence of numerous external links points to the document's primary function as a gateway to malicious sites.

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 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://pelibifir.ru/award?keyword=apa+citation+rules+pdf PDF link annotation
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/disalo.pdfIn PDF document text
    • http://world-wildshop.com/cultivation_chat_group_manga1bfi5.pdfIn PDF document text
    • https://melinifijegor.weebly.com/uploads/1/3/4/2/134265386/zosaluses_rolipivid_pezuvesusumi.pdfIn PDF document text
    • https://zifusiwi.weebly.com/uploads/1/3/4/6/134686012/kimev_nuguv.pdfIn PDF document text
    • https://cdn.sqhk.co/nakijalufiw/ggfKSgj/82326395335.pdfIn PDF document text
    • https://lokejefu.weebly.com/uploads/1/3/5/3/135301848/f5327fa.pdfIn PDF document text
    • http://luminar3-download.xyz/order_of_dagonvjs8q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485016/normal_5fe0b01ac1b97.pdfIn PDF document text
    • http://asia.kiwi/pobeporuwikevofevajajuvubkg42.pdfIn PDF document text
    • http://lovelyhouse.online/what_is_learner_centered_approachnfpix.pdfIn PDF document text
    • http://meetsol.xyz/kumapawerutoxekagn470c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379485/normal_6060397ed1dae.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/agdvkjc/map_marker_icon_size_android.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/rizijubovapuk/pefivonurapilakiwibeli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8b24316-6dfd-4a43-aa1e-953ba3b9ddf1/are_electric_blankets_any_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/852d4a6b-c0c5-4541-babf-eeb1f097f00c/19596605678.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/51082887227.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/99722506026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4247c40-b539-4a17-8da0-10e83a66808f/dazaguno.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_off0000e369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 5140 bytes
SHA-256: b1f456a8f8fd8860dba3939653781d039d5a837bc7ce94967e8534c8d41a14a4
font_01_sfnt_off0000f4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F3 10856 bytes
SHA-256: d0177dd7258927a5bc6ec6c220b2f4a0b99773f332a4d0bf2a05518dab684898

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