Malicious PDF — malware analysis report

Static analysis result for SHA-256 570174719dc28ee8…

MALICIOUS

PDF

79.2 KB Created: 2021-03-22 13:40:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 361a7816b71a4b2214c625d511c19b2c SHA-1: cd1110b53def51d485e710668a314118f41022dd SHA-256: 570174719dc28ee8d63e7baa19540a11314e120e68024caf09d0620ae4fbd577
212 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a ML classifier flagging it as malicious. The document body, though heavily obfuscated, suggests a lure related to an 'exam application form' and includes a call-to-action phrase. The presence of embedded URLs pointing to potentially malicious domains reinforces the phishing and malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/123?utm_term=ccht+exam+application+form In PDF document text
    • http://tulavesew.getenjoyment.net/fur_elise_piano_sheet_music_for_beginners_with_letters.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444123/normal_5fdba4991c4ff.pdfIn PDF document text
    • http://wijutomotagam.mypressonline.com/10080414999.pdfIn PDF document text
    • http://zitarekatinupas.sportsontheweb.net/bolted_joint_engineering_fundamentals_and_applications.pdfIn PDF document text
    • http://menedowu.iblogger.org/master_franchise_agreement.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463792/normal_5fe8a7d1ad24f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381748/normal_5fda0f3d9ddc3.pdfIn PDF document text
    • http://ruguwafe.scienceontheweb.net/2_phase_method.pdfIn PDF document text
    • http://nawilojobate.iblogger.org/nhs_guidelines_inner_ear_infection.pdfIn PDF document text
    • http://rasipafus.getenjoyment.net/what_is_anorexia_nervosa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_8c1295011e8b48ee9cef165aeb6e17c4.pdf?index=trueIn PDF document text
    • http://davofunup.onlinewebshop.net/esl_intermediate_vocabulary_exercises.pdfIn PDF document text
    • http://wugupur.epizy.com/muzemigozemaviluzimote.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/the_skin_im_in_download.pdfIn PDF document text
    • http://magakawigola.epizy.com/xixiz.pdfIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_5d571ad0b753444a89f48da1cdcbd1c1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/aprender_ingles_con_canciones.pdfIn PDF document text
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_694dde2e8bc44e96a55a8447929a740c.pdf?index=trueIn 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_off0000f850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF850 5052 bytes
SHA-256: 10b36abcde9aee06e151b25161c0ccd58a2e5077cce1bb0b2949aaa61df864c7
font_01_sfnt_off00010958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10958 11396 bytes
SHA-256: d24d5638ef37b538ba6fbf063e0f3ddca81d56f83f96cd2365c433c20d716c28

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