Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4ebf5fb1155b08…

MALICIOUS

PDF

86.4 KB Created: 2021-04-10 22:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 83c0a81f3efe801499b8d53cf4e8dbd4 SHA-1: 738deb6aaffb2a1d5ad333e9256f27cc57bc7bad SHA-256: cc4ebf5fb1155b0836f0269448844566c679f4cf0e4ff08eaf0ad64e044ace29
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The embedded URL `https://golowaki.ru/strik?utm_term=pioneer+avh-200bt+price` is particularly suspicious due to its UTM parameters and the domain itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=pioneer+avh-200bt+price PDF link annotation
    • http://jotitojimo.mygamesonline.org/jeppesen_private_pilot_textbook_ebook.pdfIn PDF document text
    • http://mowogaw.mypressonline.com/tuzisulepetabebokimor.pdfIn PDF document text
    • http://kapabifidi.sportsontheweb.net/administrative_officer_cv.pdfIn PDF document text
    • http://motorutovibipe.sportsontheweb.net/susebolufewir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_177ab5c05669431d9f8f7f60a5fb93d8.pdf?index=trueIn PDF document text
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_3cae0660ff544b299f5b4fd59192a4d3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b144366d-7276-41f7-80ff-b4328bc1927f/members_mark_bbq_island.pdfIn PDF document text
    • https://92e0cadd-ca3c-497d-ba7d-1aece6ee6da0.filesusr.com/ugd/008e52_e580f2ae4e384c0c942fe07ce0e61cb9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/tp_link_smart_plug_not_connecting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52dc2baf-e566-4e5f-b134-70d18596324a/i_am_that_book_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4d82757-eddc-499c-b154-a368e924d266/how_to_get_started_in_music_industry.pdfIn PDF document text
    • http://rodedewezijore.atwebpages.com/rak_vitrified_tiles_catalogue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eafbaa7-cf11-4d2c-8d2d-a0da7a66dc9a/uniden_dect_6.0_battery_bt-1008.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/45039406890.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0be6cce-5df1-456c-ac91-3083aab61664/16586284255.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c801621f-3c2f-4854-9f68-0e60fd774532/67035302215.pdfIn PDF document text
    • http://nununad.myartsonline.com/25237527774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0131715-50fd-4e4d-ad7a-9672a2b3d209/mubogiwejibivugef.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/zubutilumip.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/71645000268.pdfIn PDF document text
    • http://lawiferow.myartsonline.com/wuminesojanuvusi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C0 3048 bytes
SHA-256: f63f4ebd7e9a050fabfc10557eda9198c361c4570def4690fa362ff7c65c8d9c
font_01_sfnt_off0000fd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD89 5320 bytes
SHA-256: 3c3a5aee199181e827deb02023e24292d4428d45ceaa36d66ddca02f2f2f4b9a
font_02_sfnt_off00010fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA2 11388 bytes
SHA-256: 13dc9cf388ef2f33e1270b26e50091cae69a35812d80c72e5fb3c4f4e7936547
font_03_sfnt_off0001362d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362D 16244 bytes
SHA-256: 78fd140c48c5fa3aea1b5c448ecb135a3da1a671e364508663871c1644b35e13

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