Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4bc0e6315b33af2…

MALICIOUS

PDF

75.8 KB Created: 2021-02-24 12:02:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 2f0f878a603b37e6505d36ccbff19fb2 SHA-1: eea8bf067148fab0dc83b2bcef27511beb8ced32 SHA-256: b4bc0e6315b33af2410e307dae71383730337eb41e951971bd9c59cc5d952932
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan threat. The embedded URLs, such as 'https://seumenha.ru/wix?keyword=what+do+community+service+hours+do', likely serve as lures or entry points to malicious content, aligning with a phishing or downloader attack pattern.

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 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.
  • 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://seumenha.ru/wix?keyword=what+do+community+service+hours+do PDF link annotation
    • https://gavemipaxok.weebly.com/uploads/1/3/2/6/132680822/vuwolimob.pdfIn PDF document text
    • https://cdn.sqhk.co/rafumufo/O5sheie/1903357165.pdfIn PDF document text
    • https://cdn.sqhk.co/javajadoj/jhdshfq/fast_drop_in_blood_sugar.pdfIn PDF document text
    • https://cdn.sqhk.co/nemazuwigumo/PzOgcZ7/money_clicker_bitcoin_mining.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369336/normal_600afbee44818.pdfIn PDF document text
    • https://soguleta.weebly.com/uploads/1/3/4/3/134305846/8181740.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/chfhjw3/minecraft_download_pc_free_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/sirejeforox/bJojdTC/sengled_pulse_master_led_bulb.pdfIn PDF document text
    • https://madajeguruxe.weebly.com/uploads/1/3/4/3/134348767/c0104.pdfIn PDF document text
    • https://jonaditogun.weebly.com/uploads/1/3/1/4/131408899/96f88e4683.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/IeR2hdW/64019293465.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/UhcYZ3E/box_office_best_zombie_movies.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/metakibeme/gubefop.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_off0000edf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 5320 bytes
SHA-256: 9f187f0f3af8fccedb6da48a4eaae124944ee98b8b20020cc294c675bc6e7761
font_01_sfnt_off0000fff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF4 10172 bytes
SHA-256: 80de896b68f5b00fd892fb05853f40fd8b41029e68f22181a466840d361a8ee6

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