Malicious PDF — malware analysis report

Static analysis result for SHA-256 995b4a3d619d574b…

MALICIOUS

PDF

78.0 KB Created: 2021-02-25 12:05:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 120de3231b5aa55239b41a1853be839c SHA-1: f36acdb95924a048863b2d2ef64cc8b1acd9034e SHA-256: 995b4a3d619d574b01fcf456ab3cfdf3dcd1a22e9528fc5f07f9e050ab2f1ba4
146 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/123?utm_term=schlage+keyless+deadbolt+not+working PDF link annotation
    • http://xosopinogagon.iblogger.org/44011601438.pdfIn PDF document text
    • https://cdn.sqhk.co/dolavalof/bjhcjco/how_to_use_mannequin_hand_for_nails.pdfIn PDF document text
    • https://cdn.sqhk.co/moxoxitij/jcnHhex/video_call_from_cartoon_cat_at_3am.pdfIn PDF document text
    • http://wopedejani.iblogger.org/geralds_game_book.pdfIn PDF document text
    • https://dazenesulamese.weebly.com/uploads/1/3/1/1/131164173/tikusekabod.pdfIn PDF document text
    • https://jekosupoma.weebly.com/uploads/1/3/1/6/131637113/7268755.pdfIn PDF document text
    • https://cdn.sqhk.co/naboxolat/ibU0c3p/63112010043.pdfIn PDF document text
    • http://xupevagadozojad.22web.org/xakunojidufumufurala.pdfIn PDF document text
    • https://kafasomawupi.weebly.com/uploads/1/3/0/7/130775431/064666200.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/fja5hjB/sonogumezopepejupedi.pdfIn PDF document text
    • http://segway-wheelchair.ru/unique_powerpoint_presentation_templatesf6qgn.pdfIn PDF document text
    • http://refarebadas.22web.org/13205905141.pdfIn PDF document text
    • http://zesamoa.online/the_hills_have_eyes_2_full_movie_download31swi.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/redegelesibif/tesejugetedetilaf.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/pirogu.pdfIn PDF document text
    • http://xagewojijakeri.rf.gd/97378997327.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/english_myanmar_dictionary_apk.pdfIn PDF document text
    • http://wuzapulemukepux.epizy.com/i_found_a_hobby_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/battlefield_3_games_for_pc.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_off0000f17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17B 5704 bytes
SHA-256: 090a60e1473e5529185947024c2d53c1cc9cecb41b40551942ec059cdd25f165
font_01_sfnt_off000104f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F5 11112 bytes
SHA-256: 22e4068305f6a94f889d2050e587e9aea2fc19f26c1b2e665b2bf75e5daa6869

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