Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a01d664ce0bf31…

MALICIOUS

PDF

78.3 KB Created: 2021-03-17 04:49:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b04743123a55200dd08ad7d1ddc2062 SHA-1: 76753a6b1528364bfc5be53974ebf0d65635178d SHA-256: 62a01d664ce0bf317dd5119d08a20a5600ff86dd69dc77c6428c3f3eeaa2bd4c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, suggesting a link farm designed to redirect users to potentially harmful sites. The document body, though partially corrupted, suggests a lure related to 'piano sheet music', which is likely a pretext to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=dusk+till+dawn+piano+sheet+music+pdf
    • https://cdn.sqhk.co/wesuwajil/hbiajdo/free_recharge_app_refer_and_earn.pdf
    • https://lumewogomor.weebly.com/uploads/1/3/4/3/134319436/4872488.pdf
    • https://lugoponogib.weebly.com/uploads/1/3/4/4/134404253/sesadakivabukebufab.pdf
    • https://cdn.sqhk.co/toxotunem/Xieih7q/72304302615.pdf
    • https://cdn.sqhk.co/toromerepowa/jh0vCgg/five_below_store_nyc.pdf
    • https://cdn.sqhk.co/mosepoxik/QvxTUha/lobster_traps_for_sale_maine.pdf
    • https://cdn.sqhk.co/vixemujomu/lfyghiu/99861126091.pdf
    • https://cdn.sqhk.co/rapurakoke/bFhgicW/37688346327.pdf
    • https://cdn.sqhk.co/bagadogod/mjhCxhd/gardenscapes_app_cheats.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/rerinago/idle_heroes_guide_team.pdf
    • https://uploads.strikinglycdn.com/files/af463d9a-ce70-4980-a5e9-e38badc2dbee/59983112913.pdf
    • https://uploads.strikinglycdn.com/files/afba393f-78b1-4686-a953-abe25e5816ca/comparing_fractions_worksheet_3rd_grade_free.pdf
    • https://s3.amazonaws.com/gavapozalilup/39475205999.pdf
    • https://s3.amazonaws.com/sulasatevirexo/guess_the_80s_song_using_the_emoji_answers.pdf
    • https://uploads.strikinglycdn.com/files/7bdd571d-bd80-4843-8b10-c561dc8863a8/xabakokifibijobowofazawo.pdf
    • https://s3.amazonaws.com/seriposuj/kimutas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e55d.bin
d99da8c0ad642c015624618346ae229ae8f261b94b80d9ba011dfbabbc45272f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE55D 5336 bytes
font_01_sfnt_off0000f774.bin
b1b559cb1b88b75c5ff193eb9184c46de16b9a26e63f989a0a9fa4261be37958		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF774 11624 bytes
font_02_sfnt_off00011f41.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F41 4324 bytes

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