Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc5fbf99702c23c…

MALICIOUS

PDF

74.2 KB Created: 2021-03-28 01:39:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cd9d42fc2e5098087b0370deb14fdb6 SHA-1: 7193c2cf206b8e6c45ae0433f9350ca43df79319 SHA-256: bcc5fbf99702c23c9eb64d99ac57eb8caf295072d3837094c843fa8ce74af33e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/wix?keyword=digestive+system+worksheet+grade+4+pdf'. This URL is likely used to lure victims into downloading further malicious content or phishing for credentials. The ML classifier also strongly flagged this PDF as malicious, supporting the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/wix?keyword=digestive+system+worksheet+grade+4+pdf
    • http://fumuroruzej.medianewsonline.com/what_is_facts_and_statistics_in_english.pdf
    • https://static.s123-cdn-static.com/uploads/4490369/normal_5fce255e7cbe6.pdf
    • http://noksipals.online/hebrew_and_greek_bible_translation_softwarezdufk.pdf
    • https://cdn-cms.f-static.net/uploads/4414515/normal_60479ddadb59e.pdf
    • https://cdn-cms.f-static.net/uploads/4503584/normal_5fd8a06dc3b63.pdf
    • http://dfwshootersupply.com/puwagazalermmyir.pdf
    • http://tublitalia.fun/health_and_safety_sample_questionsdi7am.pdf
    • http://kigimol.iblogger.org/36077555222.pdf
    • https://static.s123-cdn-static.com/uploads/4451047/normal_5fffcb4731908.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • https://cdn-cms.f-static.net/uploads/4417827/normal_5fd65afe30204.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sanugifop.atwebpages.com/pride_and_prejudice_movie_2005_dvd.pdf
    • https://uploads.strikinglycdn.com/files/46757c10-a468-444b-beaa-1e1d4ef2c8b5/sql_for_dummies_2020.pdf
    • https://uploads.strikinglycdn.com/files/9102e96a-83dd-4cc4-9fc0-d765b29f9605/philosophy_101_textbook_free_download.pdf
    • http://fikikozazilut.rf.gd/bookworm_adventure_crack.pdf
    • https://uploads.strikinglycdn.com/files/77661c8f-7fc5-40fb-a3cb-5cc593e83f85/how_to_determine_fracture_toughness_of_a_material.pdf
    • https://uploads.strikinglycdn.com/files/2a05f296-5aa5-410a-9bb6-2d85972d8903/62992461186.pdf
    • http://fodapimogu.rf.gd/nenapinoxowejigojaruga.pdf
    • https://uploads.strikinglycdn.com/files/d61c30ee-e090-4c69-8abd-8d05d9fdbeef/in_the_mood_for_love_streaming_vf_hd.pdf
    • https://uploads.strikinglycdn.com/files/ee23aabc-910f-4a21-9007-6249fab130a7/11346325451.pdf
    • http://jelomasulavi.atwebpages.com/beyond_the_consequences_aleatha_romig.pdf
    • http://zerakunutage.epizy.com/xepamulazedino.pdf
    • https://uploads.strikinglycdn.com/files/d38c6089-9237-4e29-98ca-bf4f1c57a4d5/kenwood_ts-450_specifications.pdf
    • 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_off0000e28c.bin
361f559884260a92a029729d8cc01cf57084ba2eca852930542e07d8b654b2e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE28C 5828 bytes
font_01_sfnt_off0000f661.bin
d63a745eb603738451fe46d316722fb13c834499b87649f33cfe578e5fa66955		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF661 10704 bytes

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