Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99df77b11e82bfb…

MALICIOUS

PDF

76.7 KB Created: 2021-02-19 07:16:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ff615c31bd798d060bbcdad826d1765b SHA-1: 9518cb68cae5f5a1450f685b68977a8d5397f809 SHA-256: b99df77b11e82bfb82dc02c1b280994660d26e7398994c1dec3407c2ca5671a9
126 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF's structure point towards it being used as a delivery mechanism for malicious content, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/strik?utm_term=my+cloud+os+5+download+mac PDF link annotation
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/d1cb9e467aaf32c.pdfIn PDF document text
    • http://italywow.space/gta_vice_city_cheat_codes_liste9gag.pdfIn PDF document text
    • http://indital.space/amalina_song_in_tamilzyw9f.pdfIn PDF document text
    • https://cdn.sqhk.co/fudikuzi/zUgfWtA/zefudefijanodugow.pdfIn PDF document text
    • https://cdn.sqhk.co/salijuvam/jbghlgh/monster_hunter_world_iceborne_ps4.pdfIn PDF document text
    • http://autokenn.com/photoshop_cs6_free_filehippo8trpx.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/e091f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476273/normal_600a4eb94f8cf.pdfIn PDF document text
    • http://helplnstagramcontact6088758.com/jolopesugesumimosuvezowd9r5f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450427/normal_5ffe6c198e6ee.pdfIn PDF document text
    • https://woxisuxifajise.weebly.com/uploads/1/3/5/4/135400236/zekafonuwekexezun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406169/normal_5fd31bcd13c31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503874/normal_602f3493cdc39.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/jivagajamav/angular_6_radio_button_formcontrolname.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_off0000ee5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5F 5312 bytes
SHA-256: 1c952f857338ed62caecd6b2bf5382f0a1ea84b565f7702907ac426fe5d44034
font_01_sfnt_off00010086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10086 11120 bytes
SHA-256: 785e9636d20bce13c02c4db875d03d53660351fc4309705e0ce391fc318e0810

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