Malicious PDF — malware analysis report

Static analysis result for SHA-256 40925ad16001abe6…

MALICIOUS

PDF

85.0 KB Created: 2021-02-27 13:38:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 993e42dad146f34aea58632d269ce12b SHA-1: f2274e66c1335bdd8dd901fb434309f3f255e2da SHA-256: 40925ad16001abe6f7175654a2580dfbb3bdfc911a0ce8f293b6783394616a5a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for SEO manipulation or distributing malicious payloads. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing or trojan variant. The presence of many external links suggests an attempt to redirect the user to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/wb?keyword=where%20are%20heat%20n%20glo%20fireplaces%20made PDF link annotation
    • https://cdn.sqhk.co/jimevexir/aejcID9/winolixudeti.pdfIn PDF document text
    • http://abistrans.ru/what_does_this_emoji_mean__from_a_guyzpdir.pdfIn PDF document text
    • http://ericksandoval.com/guides_touristiques_synonymeno10m.pdfIn PDF document text
    • http://kamini33.ru/how_do_i_set_my_bluetooth_to_pairing_mode1ytxr.pdfIn PDF document text
    • https://cdn.sqhk.co/razonavari/hjbhfib/2846943034.pdfIn PDF document text
    • http://trylait.pro/948671027289z0ae.pdfIn PDF document text
    • https://cdn.sqhk.co/xaripisi/hbPbN1y/kekejuberujosaxepos.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/hdhazbj/shopping_list_for_vegan_keto_diet.pdfIn PDF document text
    • https://cdn.sqhk.co/dapumexader/dFidjdY/tanglewood_fasting_review.pdfIn PDF document text
    • http://scandisvet.ru/kapesukzd1se.pdfIn PDF document text
    • https://cdn.sqhk.co/tifozeborot/ihig6jj/spotlight_x_room_escape_walkthrough_level_3.pdfIn PDF document text
    • http://fullhp.info/jimmy_choo_full_hd_video_djpunjab0h2sf.pdfIn PDF document text
    • https://cdn.sqhk.co/loxepafigav/Mnhaja6/mechanical_engineer_technician_salary_2019.pdfIn PDF document text
    • http://vzruvayarttraff.xyz/318831838754gm87.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/retisovojor/92693289857.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/how_can_i_control_my_vizio_tv_without_a_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/block_strike_mod_apk_6._3._8.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/89611330116.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/beadboard_4x8_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/centrale_sans_rounded_font.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/49929349492.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/diredixi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10099 5368 bytes
SHA-256: 494a3853ecc223a65179151f8cbfcf3f96fd25e4771fe360e44ec2f3daafde04
font_01_sfnt_off000112b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B4 11216 bytes
SHA-256: cf4ac0e857be2ea682f49e7f1775b7f6b46fe7b706aa022e76811048ba786429
font_02_sfnt_off00013853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13853 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c

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