Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8792c8920e1a8a…

MALICIOUS

PDF

82.5 KB Created: 2021-05-26 16:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2223132cfd10adcfda6aac7c1828b70b SHA-1: 8afa9f8ca9f1eaa06ad99c3b248a74bbde836962 SHA-256: 8f8792c8920e1a8aae924b5d0f031cfb556305af614f97e74e09809e8f00a865
186 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 0.9998

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://pelibifir.ru/strik?utm_term=%25D0%25BC%25D0%25B3%25D0%25BB%25D1%2583+%25D0%25BA%25D0%25BE%25D0%25BB%25D0%25BB%25D0%25B5%25D0%25B4%25D0%25B6+%25D0%25BF%25D1%2580%25D0%25BE%25D1%2585%25D0%25BE%25D0%25B4%25D0%25BD%25D1%258B%25D0%25B5+%25D0%25B1%25D0%25B0%25D0%25BB%25D0%25BB%25D1%258B+2020 PDF link annotation
    • https://kedixusivazusug.weebly.com/uploads/1/3/4/8/134869684/sufutirafogavotew.pdfIn PDF document text
    • https://govonomuvilikiw.weebly.com/uploads/1/3/4/6/134620083/rapigofupobelur_piwovogoxagodu_dudenilosu.pdfIn PDF document text
    • https://takigufumugo.weebly.com/uploads/1/3/5/3/135345847/5459801.pdfIn PDF document text
    • https://kigimijufofudiv.weebly.com/uploads/1/3/5/9/135977026/1972579.pdfIn PDF document text
    • https://muxazufi.weebly.com/uploads/1/3/2/6/132683336/f50bd2b70e5fc.pdfIn PDF document text
    • https://puzejiwitamino.weebly.com/uploads/1/3/1/4/131453698/botitogeladu-niwagetetemuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488807/normal_60464f2eae29d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443803/normal_6020b700780e2.pdfIn PDF document text
    • https://radixukawatezod.weebly.com/uploads/1/3/4/6/134645496/lekatefobijoliju.pdfIn PDF document text
    • https://suwanozafedo.weebly.com/uploads/1/3/4/5/134587456/vijowibunugadomuruki.pdfIn PDF document text
    • https://kexoxuneve.weebly.com/uploads/1/3/4/5/134501441/lanipeguvatowe-likevivawujabe.pdfIn PDF document text
    • https://guwemegarorara.weebly.com/uploads/1/3/4/3/134353603/438f0c9096e.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/05292555-baba-4706-af13-8c2d0151dd7e/troy_bilt_42_inch_deck_belt_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bc0f962-f9b4-469a-86ad-535ae999fac2/does_xfinity_have_a_4k_cable_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cfce1cb-4986-494a-91d5-30c5446c4faf/fumemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f010cc63-a288-4958-b821-5abe06457bf3/46868116196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7aa5ffa-f52d-4a45-9b53-da16fa708596/asus_xonar_d2x_xdt_a_drivers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6284dd4a-92f4-44c1-afb8-d2527e683c6a/89065005194.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2093a971-2a89-40da-823c-9440acacf70b/indian_stock_market_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18719ad0-1510-44d4-9b57-bb079ea94dea/as_habl_zaratustra_friedrich_nietzsche_resumen.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF362 6020 bytes
SHA-256: 7a622a9b18ca24b5f9cd848f8d35e4ffde5f0719c43f79f8a73f1b61bffad7a3
font_01_sfnt_off0001078a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078A 16364 bytes
SHA-256: 2385283884bebc5de46b5c3b876830daf623a0e659f9a7be309d8febea7c310d