Malicious PDF — malware analysis report

Static analysis result for SHA-256 53770df4f8011a39…

MALICIOUS

PDF

78.3 KB Created: 2021-03-28 02:39:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31e23fe94c6a3c2e140a0cd7474c4099 SHA-1: 2e47c143c7f4e0721fa175a89e2eb09ce87bef08 SHA-256: 53770df4f8011a3927d7b777402624408379d86efd70df11e8def28e2f9fced3
134 Risk Score

Malware Insights

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

The PDF document contains numerous external links, with one prominent URL pointing to a site offering a download for 'clash of lights s2 apk'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple disposable domains and link farms further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=clash+of+lights+s2+apk+download+2019
    • http://setlyb.online/application_letter_sample_for_teacher_template53k60.pdf
    • http://vurejowug.mypressonline.com/how_to_describe_a_sunny_morning.pdf
    • http://sijiwepi.mypressonline.com/31932541826.pdf
    • http://raxejudesezix.scienceontheweb.net/emotion_cards_for_students.pdf
    • http://profoto22.ru/hp_laserjet_m1212nf_mfp_scanner_problemsvfv6i.pdf
    • https://cdn.sqhk.co/latusetime/V6SdZzH/dope_wallpaper_trill_wallpapers.pdf
    • https://cdn.sqhk.co/ganuniwiku/dgddTha/jungle_adventure_2_apk_full.pdf
    • https://cdn.sqhk.co/ravawiku/G0gjxUx/71942614470.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xogijowag.onlinewebshop.net/vimegedoporikewivima.pdf
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_b7b1d99f408847889096129a3993ea59.pdf?index=true
    • http://begujewirefe.myartsonline.com/vojiretisox.pdf
    • http://dolanuvusipegu.myartsonline.com/factores_bioticos.pdf
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_6265694f2c1b49448400339896e1a330.pdf?index=true
    • http://dexizijisub.atwebpages.com/ackley_nursing_diagnosis_handbook.pdf
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_72ce49cb90af44539247423d98f43060.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f270.bin
42dea3dc1a45743b42ff9ada8fcfbfee394f4b0d1fc3427ba5ba31a216c4c05d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF270 5748 bytes
font_01_sfnt_off0001061e.bin
5d404982d2691ff5cceedea200d8e5bacb6efc0f08e38cd041aa29811d9f51eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1061E 11100 bytes

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