Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3af30fd29ebc5f8…

MALICIOUS

PDF

75.5 KB Created: 2021-02-21 04:19:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bd8c68b34ad84835efe396e99ea5166a SHA-1: 8860b89c2e7c0c276d5dc9aeeee34db9d6de87d0 SHA-256: a3af30fd29ebc5f861f202fc3c775543a3202dad9b5f4dd593ca12cc74e83ff9
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search results or distribute content. The presence of URLs like 'https://baarspo.ru/wix?keyword=clash+of+lights+apk+download+2020' further indicates a lure for potentially unwanted software. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://baarspo.ru/wix?keyword=clash+of+lights+apk+download+2020 PDF link annotation
    • https://cdn.sqhk.co/xuluriwu/ihfjhZb/tv_streaming_app_for_android_phone.pdfIn PDF document text
    • https://pulatufulufu.weebly.com/uploads/1/3/4/6/134610330/eab483ca.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/FhiSgii/lego_jurassic_world_dinosaur_rampage_game.pdfIn PDF document text
    • https://xajakubadom.weebly.com/uploads/1/3/0/8/130874473/1591554.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/O4hgIhj/best_twitter_app_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/rosojolude/jchgUNQ/gobosegokosofa.pdfIn PDF document text
    • https://cdn.sqhk.co/tamurikubol/gjgabgf/colony_wars_ps1_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/mozulunilex/i7rhiid/world_map_of_stereotypes.pdfIn PDF document text
    • https://pebajubidu.weebly.com/uploads/1/3/1/3/131383648/wedik.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwaseja/20jRKjg/freeway_ford_truck_sales_45th_street_lyons_il.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/ihhShfd/wedding_cake_icing_designs.pdfIn PDF document text
    • https://kezidixujaroko.weebly.com/uploads/1/3/4/0/134040737/fc2bb92a503304.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/sitozi/how_many_books_are_in_the_you_series_by_caroline_kepnes.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/android_toolbar_elevation_when_scrolling.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/airtel_postpaid_plans_chennai.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/experience_certificate_word_format_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/weather_report_of_ranchi_may_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/parkitect_starter_guide.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_off0000ea31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA31 5540 bytes
SHA-256: 7c846e399cfeaa8a1256b614567d6f9c4ad10886bfc2685df6b94d0a98ae5ac4
font_01_sfnt_off0000fd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD25 10368 bytes
SHA-256: f832fdd9c10ac7d81452762d8fd5eb67720831849d82539c8536fc84f1e3fb1b

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