Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0884ddf67fb5724…

MALICIOUS

PDF

90.8 KB Created: 2021-04-04 14:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e92071ceb7b7ddc6131405324140a6e5 SHA-1: 23cc095cd11812b08423a5148ae6738cab11b9af SHA-256: f0884ddf67fb5724d55e9ea072937355876fe2862fb9ce8ab243102de14397f9
166 Risk Score

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. 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 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 link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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.
  • 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://xezojetit.ru/award?keyword=research+about+child+and+adolescent+development+pdf PDF link annotation
    • http://privateguardingserviceagainstdanger.site/10897108194tvh4j.pdfIn PDF document text
    • http://reduslim-italia.website/iap_guidelines_for_enteric_fever_2015j2958.pdfIn PDF document text
    • https://cdn.sqhk.co/kevovevude/iejeghr/mountain_bike_pedals_flat_or_clipless.pdfIn PDF document text
    • http://bioforce-co.site/nigakopokuvekefifap7zf9.pdfIn PDF document text
    • https://cdn.sqhk.co/wafudovop/ji7481A/99039821702.pdfIn PDF document text
    • http://airbin.top/xinukogutotovebugofhp8z.pdfIn PDF document text
    • http://manthoughtswebsite.website/wumilhxnn9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc13a3d7-2076-4223-a8a4-4bfbdd194e8c/ge_p7_oven_dimensions.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/parachute_linen_sheets_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb1507e2-b7f3-4e09-b938-0f19f8a6a344/15199344196.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/nogusan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0023fc7-f131-4f07-989d-2206123ec608/how_to_write_an_opinion_paragraph.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21ab6b99-99b3-4e8e-8d05-2936ccac1afc/77494324162.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/epic_7_beginner_guide_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/650e8cce-d599-46a1-8c56-6deeb03190f6/how_to_make_a_greek_toga_out_of_a_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/advanced_systemcare_for_android_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fcff488-c769-47d4-ba91-c57d10b34075/96414016020.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/80720907576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55ea113c-998d-42e1-9e63-39e069d56c0b/digidesign_mbox_2_pro_driver_windows_10_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f4a0a6e-94bd-4a3c-a72d-d03e4fb5ac81/texenebuxilorasas.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001110a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110A 5604 bytes
SHA-256: ef59cf448ea319283a24cfdbf7b0b847199be8a2953bfd628f026159b1a68ca6
font_01_sfnt_off000123f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F5 10640 bytes
SHA-256: eafafc9e280e0404fc27a292ac500b25d0669f726a20befe52f5ffe7e4382e20
font_02_sfnt_off000148a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A3 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953