Malicious PDF — malware analysis report

Static analysis result for SHA-256 015e73865390029b…

MALICIOUS

PDF

87.0 KB Created: 2021-03-30 16:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 739c376f1b6902daebea41ae5c14193e SHA-1: 80fbc5529876c87092cc191af5a6cf15eaa09731 SHA-256: 015e73865390029bbfd2ea1b6d7f888c4d86cedc895e56b595b005edec0bbbe9
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://resalured.ru/award?keyword=czytanka+po+angielsku+dla+dzieci+pdf PDF link annotation
    • http://blancop.xyz/vejosiwoizx.pdfIn PDF document text
    • https://bewotababuruga.weebly.com/uploads/1/3/1/1/131163836/rixapagexod_dufufajuwe.pdfIn PDF document text
    • https://pasazobunev.weebly.com/uploads/1/3/4/6/134670772/simuma.pdfIn PDF document text
    • https://temizitukopisir.weebly.com/uploads/1/3/4/8/134898891/6618690.pdfIn PDF document text
    • http://taxurofetizi.22web.org/my_talking_angela_apk_unlimited_money.pdfIn PDF document text
    • http://infokurs.design/kepigupzg6l.pdfIn PDF document text
    • http://sun-italy.space/how_to_open_spreadsheet_in_macbookszq7j.pdfIn PDF document text
    • https://pevamuwewewi.weebly.com/uploads/1/3/4/6/134636281/a36d4875af13ca7.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
    • http://satikemapobivix.epizy.com/sand_blasting_machine-_ql-_1006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aafa49e-2614-4484-843c-de7f4ff99904/52462786078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04b0dd35-a466-4191-a2be-65d817c99d0d/zoo_york_watches_waterproof.pdfIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_f29652a404ff4933bd753c1da18f2e18.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/229ae45e-73ad-435d-bde6-eef8a8f1a663/the_last_song_full_movie_online_123.pdfIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_3a63ac3b051d46b1910890956edb96a5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf81c913-d9ae-47ce-9487-5d99510a45e6/interactive_hundreds_chart_missing_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3837742c-c403-4dcc-86b7-a3df301311b7/the_meaning_of_marriage_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b1d4e77-2434-483c-965b-029c3d6765b7/how_to_pair_aomais_speaker_with_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1f7f302-2581-4e15-a0b8-d87c56009247/what_is_a_99_year_lease.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4598bb7f-c778-4795-af76-b58577bbb4f0/how_to_add_mp3_to_iphone_using_itunes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6b3d7ba-b667-4639-8bb6-d468274bb578/14652166221.pdfIn PDF document text
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_82cc1054ca8c4c59922a595fac3613a2.pdf?index=trueIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_a24b455009104bce8df9f8dd690dc0a7.pdf?index=trueIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_c5f5842eb6e84dc981b163baed21a81c.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FB 5348 bytes
SHA-256: e8358fbb12bba549e08db1abb50ff3b862465bb97810872f86ee60277a4b1a8e
font_01_sfnt_off0001195e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195E 12376 bytes
SHA-256: 210ee02c1f1efd2048db523dc9c830454fcc171bebad88915594c389902b4040
font_02_sfnt_off0001401e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1401E 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176