Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a70ffc4d34f0dba…

MALICIOUS

PDF

87.4 KB Created: 2021-02-17 14:29:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 437fd0eb5251a9225633bf184d38b5d7 SHA-1: 8746dca8d7cc0eaae4941144ffa6939262c6b9a2 SHA-256: 7a70ffc4d34f0dbac3223a653a9215e8778484252742929d58d9637fed4316db
134 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a high concentration on disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially used as a lure.

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://leonvi.ru/wix?keyword=tw+hunter+middle+school+dress+code PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374980/normal_5fca140870dfa.pdfIn PDF document text
    • http://fozakewugumomig.22web.org/sijupobijakeka.pdfIn PDF document text
    • http://voxamuzovo.22web.org/autothermal_reforming_and_steam_reforming.pdfIn PDF document text
    • http://metalllift.ru/sapobur423mm.pdfIn PDF document text
    • http://comforfemj.fun/40064691277hmd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379841/normal_600b3dcc10df7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483856/normal_601f8e2171b40.pdfIn PDF document text
    • http://reactivascotia2020.com/97294992499sqfnx.pdfIn PDF document text
    • http://soul-felt.com/3059163337yx9oc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dikobepibelun/disonexirajegitados.pdfIn PDF document text
    • http://zakivijojinikij.epizy.com/kentucky_criminal_law_manual.pdfIn PDF document text
    • http://todinig.rf.gd/wasot.pdfIn PDF document text
    • http://digimoxesimukus.rf.gd/bonjour_mon_ami_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/apple_music_app_won_t_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/can_gamestop_fix_my_2ds.pdfIn PDF document text
    • http://logoroxesum.epizy.com/47874833571.pdfIn PDF document text
    • http://pejinubonuxus.epizy.com/42878931558.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/cdrl_dd_form.pdfIn PDF document text
    • http://mibexumobanoko.rf.gd/45757945115.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE5 4892 bytes
SHA-256: 2ae38ae0aa2ff2c7c8796066233ce0f915ebddf62f74e1677ccb1e3e26265c5d
font_01_sfnt_off00011d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5F 10808 bytes
SHA-256: 699a6dab605bd4fffc6938ab8a5ec946de6a955ba3417e439be7229c2a3af0de
font_02_sfnt_off000141cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141CD 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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