Malicious PDF — malware analysis report

Static analysis result for SHA-256 091553089ec4642c…

MALICIOUS

PDF

78.1 KB Created: 2021-04-01 17:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7211b72073eb180a22bdb7c6959a2f77 SHA-1: c30c2510972fbbfd9aca012412c91dca4383e8df SHA-256: 091553089ec4642cc5a72d9578e202b2e0b19ed296f65ec301f263b6fb94b3cb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/strik?utm_term=speech+and+debate+stephen+karam+pdf PDF link annotation
    • https://wijedokimevu.weebly.com/uploads/1/3/4/6/134649091/2d2422.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459941/normal_60345ad027e7b.pdfIn PDF document text
    • https://jodawozuwiki.weebly.com/uploads/1/3/1/4/131437728/1223184.pdfIn PDF document text
    • https://bidumijedurazi.weebly.com/uploads/1/3/1/4/131437194/vodexotutovu.pdfIn PDF document text
    • https://cdn.sqhk.co/kadefowuvun/V8ijZuV/ponux.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/jjgfTdw/10_band_eq_settings_for_metal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476288/normal_5fe5db265f94c.pdfIn PDF document text
    • https://cdn.sqhk.co/gevajoke/jjmhbid/ball_smasher_hack_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/juwafajem/3ha8thc/66244333021.pdfIn PDF document text
    • http://nuduxebevevewu.22web.org/food_test_for_non_reducing_sugar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469374/normal_601d868e6b03d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476273/normal_601ad496eb35a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef896ab0-f44f-44b4-8e43-125e0a15dcc7/duxulanenolelozirijorag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1ffdca3-e8e3-4542-952e-86d206ea2f65/89495157989.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/datasheet_555_timer_ic.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/programming_problem_solving_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/cf_auto_root_i9300_4._3.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/do_tomatoes_grow_all_year.pdfIn PDF document text
    • http://xonifovozub.epizy.com/international_criminal_law_handbook.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/26459541758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7eda7a0-eb46-4db5-ba5e-1bca828442c2/rapokemevosinozonofu.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_off0000f184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 5668 bytes
SHA-256: b52937e2c6136b71d2d808751346756d7b94bfc84ed76c6b45c862655d411508
font_01_sfnt_off00010499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10499 11220 bytes
SHA-256: 08f434492e2d7c9927ea8888ec4bd1185db62378c163c5d88c40f9d1b33e3d5e

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