Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c418db67d5444d…

MALICIOUS

PDF

93.4 KB Created: 2021-05-10 10:40:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ed49955fc4ab71110ea624b2df325b61 SHA-1: 1beeb60be28b45b2f39621e0e89bb59935970e4a SHA-256: 52c418db67d5444d5c45343fbef8de693df3d7ea9da8abf7701fe962188b2697
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9997

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://ponafet.ru/strik?utm_term=gmat+club+sentence+correction+tips PDF link annotation
    • https://cdn.sqhk.co/jenetuwuda/BEjegjd/42922128534.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495065/normal_60071eddcc64f.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/zasatevufukipaxitisep.pdfIn PDF document text
    • http://copyright-rules-help.com/how_to_connect_turtle_beach_to_xbox_one_controllerocq4h.pdfIn PDF document text
    • https://cdn.sqhk.co/narivujuraf/hBvYsih/63337007955.pdfIn PDF document text
    • https://cdn.sqhk.co/dugixikisim/rhb58if/15575951433.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457590/normal_6023de9c5a809.pdfIn PDF document text
    • https://cdn.sqhk.co/vopunokapire/XgcrXhi/92787725719.pdfIn PDF document text
    • http://outputqwvk.space/chuck_palahniuk_guts_readingtalmt.pdfIn PDF document text
    • http://fesalasan.mygamesonline.org/12485704475.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476954/normal_5fe54cbc3b1b4.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/32411298028.pdfIn PDF document text
    • http://kujunat.medianewsonline.com/how_hard_is_the_comptia_server_exam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374954/normal_6063ae053e837.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/kalanejaxutilif/88418184208.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/32414101337.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/bharatha_rajyangam_telugu_free.pdfIn PDF document text
    • http://kuxubakelixuzot.atwebpages.com/18393148899.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5c8bf0b-19a6-4910-a384-231baf25c753/nanazefixufipekabirudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29b7403b-391d-4450-9d28-fd8d7bb75354/what_is_the_default_password_for_swann_dvr.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_off0001214e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214E 5132 bytes
SHA-256: de0d9fc65a40ce46ab636303f2bb8a685802d2a64772a7a2441ba0616f909a18
font_01_sfnt_off000132a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A1 11252 bytes
SHA-256: 4cb3d232d0dbc10b876c4b2846f958836a44f6b9ab519f1e34ab3b49a3a75bf9
font_02_sfnt_off000158da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158DA 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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