Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a214c7ae7f260e…

MALICIOUS

PDF

76.4 KB Created: 2021-04-22 11:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a9650767c98e9b4ba4fe1005aaa921d5 SHA-1: b463519590425651b76c537272f901598fbff305 SHA-256: b5a214c7ae7f260e63b50aa7841b38c1407bb896ab9930c216b0a1eb6fb7ef13
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'free download' and 'Telugu baby boy names', indicating a lure for users seeking specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://soxebez.ru/strik?utm_term=telugu+baby+boy+names+pdf+free+download PDF link annotation
    • http://diporesorojina.scienceontheweb.net/statistical_methods_for_spatial_data_analysis_schabenberger.pdfIn PDF document text
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/e73d4a56.pdfIn PDF document text
    • http://dufazesiz.mywebcommunity.org/houghton_mifflin_harcourt_collections_grade_7.pdfIn PDF document text
    • https://cdn.sqhk.co/nusekuferiva/Ogijia7/11020069614.pdfIn PDF document text
    • https://cdn.sqhk.co/nivatasob/4hbcTVX/xunibikomajodi.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/hr9oY8W/jelly_shift_game_online.pdfIn PDF document text
    • https://woziwapimarezex.weebly.com/uploads/1/3/5/4/135400795/sorumasomogoded_buzasibuz_wogote.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/picjcjD/hypermarket_3d_level_3.pdfIn PDF document text
    • https://cdn.sqhk.co/ribegibonot/OhcTCia/fortnite_logo_template_no_text.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/loxopudizus/35814111030.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d456809-7c15-4656-82d6-d257146d2c6a/microsoft_word_help_with_table_of_contents_formatting.pdfIn PDF document text
    • http://teluroluxeterez.myartsonline.com/81687230281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1ed8b9c-6035-4bd1-a1d4-4c27d1f2a7a5/ihip_bluetooth_headphones_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aee27ba-04bf-4b97-a22f-356ff216e9b8/20893558674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba32d3b7-91cc-47c8-847d-42fafbba3409/how_to_fix_dyson_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f13b8899-ddd5-4f95-8777-dda4ab66b342/pedestals_for_washer_and_dryer_lowes.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/28502167973.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_off0000e965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 5644 bytes
SHA-256: e4ae0807ffff44e75a514b5d419ee7b2832b973143325755e4cb95de30c17687
font_01_sfnt_off0000fc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC97 11888 bytes
SHA-256: cf5acb380773f494ca89142ae3de225156813308813550d65abbf842524645c1