Malicious PDF — malware analysis report

Static analysis result for SHA-256 92cfc402834985fb…

MALICIOUS

PDF

79.5 KB Created: 2021-03-15 10:12:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cfdccad534b9ebd845fbf6b18192bf01 SHA-1: 1193638e2a8fd92b2604b76ab5df9fbb42f81a4d SHA-256: 92cfc402834985fbc980aa9c555723cbe3a6e1c2fe56bfa4f38282d4cbb5d9f1
146 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9990

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://leonvi.ru/strik?utm_term=was+seals+cancelled PDF link annotation
    • https://cdn.sqhk.co/jedelamodafa/fvigDBt/super_mario_adventure_2_game_free_download.pdfIn PDF document text
    • http://cosmicgig.com/2018_bar_exam_questions_and_answers_mercantile_lawhpb6p.pdfIn PDF document text
    • http://edapog.online/gavinojugelupuxopaqyp78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375703/normal_5fff2b167fba0.pdfIn PDF document text
    • http://topvideo.design/breve_storia_della_lingua_italianazqym0.pdfIn PDF document text
    • https://cdn.sqhk.co/zubuwebofe/xmeNjhT/spy_camera_buy_online_usa.pdfIn PDF document text
    • http://resimpub.com/33710534488zrmmo.pdfIn PDF document text
    • http://smartcreditcheck.info/what_are_the_most_misused_wordsosxr2.pdfIn PDF document text
    • http://chebsvet.ru/spyro_canyon_speedway_orblnbir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506131/normal_601b55cd56978.pdfIn PDF document text
    • http://gratoramaa.space/five_nights_at_freddys_game_2_scratch9tei5.pdfIn PDF document text
    • http://evakuator-uga.ru/pecoricco_formaggio_canestrato_primo_saleevv3h.pdfIn PDF document text
    • https://cdn.sqhk.co/turaxulefa/4Xgj4gd/kasanozake.pdfIn PDF document text
    • http://zeropium.com/bekufejesikuzitp4oxh.pdfIn PDF document text
    • https://cdn.sqhk.co/teforoke/jjyTOhi/kikejalifaw.pdfIn PDF document text
    • http://shop50off.info/7171920661gg1p6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417208/normal_603e3ec92ff9b.pdfIn PDF document text
    • https://cdn.sqhk.co/xurinuwame/mJ2ifif/15689306067.pdfIn PDF document text
    • http://jozejibojofeku.22web.org/beguniro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nakepusigazu.epizy.com/free_printable_blend_worksheets_for_kindergarten.pdfIn PDF document text
    • http://rimiwomo.epizy.com/28874248727.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/css_stylesheet_header_code.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/doraemon_video_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/harry_potter_1_full_movie_youtube.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/vutonaxed.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_off0000f6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6ED 4848 bytes
SHA-256: 1a7abc5eac07da5f7d41caa578ea45548515fc5a561ae094f7d18b0b22c1d191
font_01_sfnt_off0001078c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078C 11972 bytes
SHA-256: 73cc0a1ac4f0e511e57c6474c49b1d4b995a722ff7224d2a5bd74e2c69241014

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