Malicious PDF — malware analysis report

Static analysis result for SHA-256 1751c40eeb74bc60…

MALICIOUS

PDF

77.9 KB Created: 2021-06-11 11:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8345b85e074ecd244b32080bf0a700aa SHA-1: aa4a24a3ce7096251fd84d728e45c578d1266486 SHA-256: 1751c40eeb74bc609de78762b377f766e00fc196def92c16c8bd50e13cb491a2
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting services and are part of a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The document body, though heavily obfuscated, contains text related to installing Windows 10, likely a lure to disguise the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 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://medvor.ru/pbw?utm_term=install+windows+10+from+iso+file PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422640/normal_6051cf59ad88d.pdfIn PDF document text
    • https://rulodewarozuw.weebly.com/uploads/1/3/4/6/134678260/borukusik_pogedi_jemuxe_pemujewiru.pdfIn PDF document text
    • https://mopobaseburole.weebly.com/uploads/1/3/4/8/134859053/1100855.pdfIn PDF document text
    • https://puxivulikuvudet.weebly.com/uploads/1/3/4/6/134663564/3220255.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416494/normal_5ffd7c708fa77.pdfIn PDF document text
    • https://tenusalawumuta.weebly.com/uploads/1/3/4/3/134332014/cf786654.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421462/normal_5ff20fd87f8e2.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
    • http://povelin.pbworks.com/f/18469364501.pdfIn PDF document text
    • http://gipovowi.pbworks.com/w/file/fetch/145077990/lavozisemaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8765e17-02a5-4542-af8f-18bceced9df3/ragofonuk.pdfIn PDF document text
    • http://serawazeg.pbworks.com/f/bad_romance_notes_for_piano.pdfIn PDF document text
    • http://gogoporiwo.pbworks.com/f/13906460558.pdfIn PDF document text
    • http://nozobitativi.pbworks.com/f/85834801902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41c76a20-4c1c-454c-877b-4e92a2d95e7d/kivukufodanutexafadopef.pdfIn PDF document text
    • http://fipivuzigoge.pbworks.com/w/file/fetch/144424275/65951807269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/320b849c-66f7-47a3-a25a-7279dd577cdf/how_much_is_a_used_husqvarna_riding_lawn_mower.pdfIn PDF document text
    • http://sazupamufode.pbworks.com/f/past_tense_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ec2b70b-0a40-4e7b-9e28-02caf7c6eb9e/the_tenth_insight_book.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/w/file/fetch/144415176/74396735719.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/f/3714549776.pdfIn PDF document text
    • http://wiwudoje.pbworks.com/w/file/fetch/144853521/58241698683.pdfIn PDF document text
    • http://lomexalipele.pbworks.com/f/toy_story_3_game_download_for_ppsspp.pdfIn PDF document text
    • http://pimepovume.pbworks.com/f/40114890357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aae67af2-24dc-4f36-9f60-87cca2c2c36b/what_translation_is_the_gutenberg_bible.pdfIn PDF document text
    • http://gamaxidad.pbworks.com/f/sight_word_stories_read_aloud.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/w/file/fetch/144434787/cicero_on_obligations.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_off0000e54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54E 5064 bytes
SHA-256: 0eab3c766eb70d0f5993b66d93d69959bd4a939c4e496751608a350bbe949340
font_01_sfnt_off0000f673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF673 10728 bytes
SHA-256: 7d87a8c118a592d3840a33fb66c8343815e6529d05abadde0ef083cefa635655
font_02_sfnt_off00011b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e