Malicious PDF — malware analysis report

Static analysis result for SHA-256 9290095445f1dbac…

MALICIOUS

PDF

76.7 KB Created: 2021-02-25 20:08:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9685a626be54a0b96dc1a4b8e5d41fae SHA-1: f1b68337b1a0370f3a83fbd20e06efbf1b7b0b78 SHA-256: 9290095445f1dbac81efe142e8cbac222d67a5009291c0c24bf2671e49d9e034
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, including a primary one that suggests a lure for downloadable templates. The presence of a mass external PDF link farm indicates an attempt to distribute or obscure malicious content through a large number of linked PDFs. No scripts were extracted, but the PDF structure itself facilitates the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://druttle.ru/award?keyword=downloadable+smart+goal+template+pdf PDF link annotation
    • https://rowopubogapog.weebly.com/uploads/1/3/4/2/134234702/pureginaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382949/normal_60177a64585e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392193/normal_5ff0752ceb482.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/cjjc6Nm/vsco_lightroom_presets_buy.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/cgfgfih/pilivirelenedadav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468267/normal_6025a8464a970.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458826/normal_5fc9e8b2b7d6e.pdfIn PDF document text
    • https://cdn.sqhk.co/rivitovolu/hjDFKgj/marvel_s_runaways_season_2_episode_12_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/eWjbicx/7digital_music_store.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469643/normal_60145b8980c07.pdfIn PDF document text
    • https://cdn.sqhk.co/kosadara/blhijgG/piano_keyboard_notes_online.pdfIn PDF document text
    • https://cdn.sqhk.co/vewukiziwemi/f5gdShd/texas_country_music_charts_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/6DhbicL/last_day_on_earth_survival_zombie_list.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://judewal.rf.gd/cbse._nic._in_improvement_form_2020.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_off0000ef88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF88 5592 bytes
SHA-256: 6d65a2ef63890c8bdf9fb8a1054e565d0ebe6acfcb60541093dca0849bde626b
font_01_sfnt_off00010288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10288 10444 bytes
SHA-256: b1b3471072808d87464d95cf599ebb2058688a067c36e3b69ce1725810e7fc3a

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