Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57e68e3821d11bf…

MALICIOUS

PDF

73.7 KB Created: 2021-02-13 08:54:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5dfec86df89e610d458f153ae9e09731 SHA-1: c9f55106fe7cb3da686765a79b36e422eb2628ac SHA-256: e57e68e3821d11bf299ca635d48ebd328d20bb826498440c695d2962ee7930ce
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The embedded URLs, particularly the one pointing to 'crophysi.ru', are identified as part of known malicious infrastructure. This suggests the document's primary purpose is to lure users to malicious websites, likely for phishing or to download further malware.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=atrial%20fibrillation%20ecg%20waveform In PDF document text
    • https://cdn-cms.f-static.net/uploads/4411932/normal_5fdbb1b42954b.pdfIn PDF document text
    • https://cdn.sqhk.co/jebumujo/gejdiha/tuner_evolution_anaheim_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/ugeNkDL/big_head_basketball_games_online_free.pdfIn PDF document text
    • https://dugegedop.weebly.com/uploads/1/3/4/3/134338267/8ee3d9bc10.pdfIn PDF document text
    • https://cdn.sqhk.co/nejisakatok/hDJlha8/80754253864.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487007/normal_5fde3e2b2e699.pdfIn PDF document text
    • https://cdn.sqhk.co/ravawiku/HhQVPhh/91647534223.pdfIn PDF document text
    • https://cdn.sqhk.co/bevurokakug/edjhggc/flydigi_game_center.pdfIn PDF document text
    • https://cdn.sqhk.co/semiwewedazi/jjzqAib/vigosepajebufebejepobaji.pdfIn PDF document text
    • https://kewakovek.weebly.com/uploads/1/3/4/4/134467638/jogarujenabuf.pdfIn PDF document text
    • https://cdn.sqhk.co/difanemifal/Kgjjbjt/kingdom_wars_tower_defense_hack.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377371/normal_5fd06a07b2de2.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzexesetaba/giic5gd/8654469667.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/golepe/taj_mahal_history_information_in_english.pdfIn PDF document text
    • http://nojekakanafigi.rf.gd/process_flow_diagram_template_powerpoint.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/jezorikuseratekulav.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/bmw_225xe_iperformance_wiki.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_off0000e472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE472 5304 bytes
SHA-256: 9c428b1596df0918a016be90173a7a26e37a6970c57d3c3534b764f0a33b316c
font_01_sfnt_off0000f685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF685 10320 bytes
SHA-256: e52e4fbd165c440f50db9c891219b322f96e43a18628cef8a13ab8f01e346eec

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