Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c730dda44116f32…

MALICIOUS

PDF

83.2 KB Created: 2021-03-21 05:46:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 4e02f934cdff0578446e31975fc6acc4 SHA-1: 615ddb3298341f423abbefa832903dbaf1e2fbe0 SHA-256: 5c730dda44116f32433b69043e15cfb2ae65137dc71c89f0268a61449beb1d5f
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. It also contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The embedded URLs and the document's structure indicate an attempt to redirect users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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/wix?keyword=kite+flying+games+download+for+pc In PDF document text
    • http://borejukeluteva.mygamesonline.org/us_history_events_of_1900s.pdfIn PDF document text
    • http://devivitonewe.sportsontheweb.net/attach_files_online.pdfIn PDF document text
    • http://kogutojoveso.mywebcommunity.org/jerukigevufafofen.pdfIn PDF document text
    • http://kigirifaduguv.getenjoyment.net/vtech_3_handset_cordless_answering_system.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://uploads.strikinglycdn.com/files/e86babb5-aedd-4888-b042-8368d9362307/samsung_hmx-f90_price_south_africa.pdfIn PDF document text
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_fd6cce20add046cb99f1f439d032408f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/04c9d6ac-0dc6-42f3-af51-894dc18fcffb/allison_transmission_diagnostic_trouble_codes.pdfIn PDF document text
    • https://3ced707c-20bd-49bb-93f1-edb15be4e391.filesusr.com/ugd/e90305_7362c644f3ca41e5bb9e8547b47751ff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sudevejerifu/antibiotic_groups.pdfIn PDF document text
    • http://dowuvoduwitovos.atwebpages.com/55099730047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9519549f-3815-4020-8347-2ae4b0cb4534/how_to_set_up_a_lure_for_flathead.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/memunuxomimivitipum.pdfIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_10967fa31a504f2998668d46347371bb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fekife/conceptual_physics_textbook_chapter_2_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df144504-6b9f-49c4-aa3f-bfb51f777e82/gowiguradofilatowuwote.pdfIn PDF document text
    • http://filosoko.onlinewebshop.net/management_of_acute_decompensated_heart_failure.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/online_math_tutoring_platform.pdfIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_dc4416e82f8749f4a68c98d9107ebe3d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/872a1633-db86-4b40-b331-8436e449a278/dewalt_12_volt_lithium_ion_cordless_drill.pdfIn PDF document text
    • https://2cc12256-1025-444a-bacb-901a9f007bda.filesusr.com/ugd/d1fcfc_224c43be848346a9867ad6bdf95d3544.pdf?index=trueIn PDF document text
    • http://wobadumiravolu.atwebpages.com/63887749364.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/jaxam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa9484a4-b0f0-46fa-ad46-55a5e5537911/monitebidodufebumolilinov.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_off0000f8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D4 5428 bytes
SHA-256: e28276fc69cffee9991dc4d86ba36fc9869f38bc8c3142eb780693fc0e2d982d
font_01_sfnt_off00010b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B54 11016 bytes
SHA-256: 8598dc1f296f2b03cdbdc743d2c6c98b527b57f49fb9e324348785e22a61e98a
font_02_sfnt_off00013106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13106 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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