Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a82afe5bbda7aad…

MALICIOUS

PDF

68.4 KB Created: 2021-02-14 11:22:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 49710239f0850a67941bdefc4d29995c SHA-1: 926be482dae60e7a908da94602ce947f609d0618 SHA-256: 5a82afe5bbda7aad00ce3e0707ebb29b69ebe8fe9c96e7530a952877d56c5005
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are hosted on disposable or dynamic DNS services, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to its creation, but no direct user-facing text that would indicate a specific lure.

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://bologen.ru/wix?keyword=diamondback+road+bike+reviews PDF link annotation
    • http://popapirim.22web.org/codice_appalti_preinformazione.pdfIn PDF document text
    • https://xazebuwojij.weebly.com/uploads/1/3/4/4/134467588/d391ca52c72.pdfIn PDF document text
    • http://daating19.site/sword_art_online_alicization_light_n5n82i.pdfIn PDF document text
    • https://dezekebewefe.weebly.com/uploads/1/3/4/7/134731304/defowawidevebevif.pdfIn PDF document text
    • http://abzac.me/55682851962wri7c.pdfIn PDF document text
    • http://lovechat24.club/payment_terms_and_conditions_samplebsiqo.pdfIn PDF document text
    • http://fodamibokaf.66ghz.com/avakin_life_mod_ios.pdfIn PDF document text
    • https://disadoxamegipu.weebly.com/uploads/1/3/4/5/134527150/rijizonopajuruxeb.pdfIn PDF document text
    • https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/mepifubibesar.pdfIn PDF document text
    • http://rating-bookmaker.ru/gorillaz_andromeda_zhu_remix63ltd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suvowafavij.epizy.com/72888750271.pdfIn PDF document text
    • http://sajonagot.rf.gd/kijifu.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_off0000d07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07B 5408 bytes
SHA-256: 106779035f8ff363381a8449570980bd385c3b826e18e7f7c9d2191dd622f15c
font_01_sfnt_off0000e2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E0 9948 bytes
SHA-256: 8aa9ef0bad41f62f59ad9280e5da3bdb49e641948fa331b12f6349bf8b6f3274

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