Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f1ad79b1e5709bd…

MALICIOUS

PDF

78.3 KB Created: 2021-02-27 10:55:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e54a66fac81ba105a693de35b4e172bf SHA-1: 009fb3c73474ef7ffb36ec09325a797cb5285ff2 SHA-256: 2f1ad79b1e5709bd03fe05836d9a1c5e7dc67943e320ec3975783ef6cc1362fc
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially harmful content.

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://leonvi.ru/wb?keyword=how%20does%20hampton%20bay%20fan%20remote%20work PDF link annotation
    • http://lebepufu.mypressonline.com/is_blood_of_olympus_the_last_book_in_the_series.pdfIn PDF document text
    • http://rineset.xyz/74635323526vyu8b.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/kujijoxegebag.pdfIn PDF document text
    • http://wujejejifi.mygamesonline.org/25064281394.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450141/normal_5feda3d3d944e.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/ySgcykF/9491755868.pdfIn PDF document text
    • https://cdn.sqhk.co/ledumixifer/njgjex8/jidokoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394061/normal_5fd3dcb07fc24.pdfIn PDF document text
    • http://nebo-baikala.ru/betternet_vpn_proxy_mod_apkdafr4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418197/normal_602fbc3874ed4.pdfIn PDF document text
    • http://eslivdrug.space/lopavokuriminiminakerukip8ocfw.pdfIn PDF document text
    • http://kovuzaxaf.medianewsonline.com/whats_the_magnitude_of_the_centripetal_force.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/heroes_of_olympus_box_set_target.pdfIn PDF document text
    • https://cdn.sqhk.co/lujipalaf/heiihcb/eset_parental_control_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pozuwifofub/heZ3icL/dwayne_haskins_college_highlights.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478127/normal_60038ae1deac8.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/zuwosil/pemitafekubupepumig.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/pururipidunujirat.pdfIn PDF document text
    • http://wojibikifi.myartsonline.com/chronicle_of_a_death_foretold_chapter_3.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_off0000f3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D4 5608 bytes
SHA-256: d5af905b65f65bae716015c950beaaf4d9feec77dff934e42406f953908da8b7
font_01_sfnt_off000106cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CF 10804 bytes
SHA-256: 7bbd46e6eb2d8235cae30e71bc011cf5d5550e0c81c4bad27c4985a179d7024b

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