Malicious PDF — malware analysis report

Static analysis result for SHA-256 8726f704dc3b7ab6…

MALICIOUS

PDF

91.0 KB Created: 2021-05-31 06:40:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 84976c1c17e6a262624faf459d8ca0c2 SHA-1: 965b186512b2da137db6fa99dd1262c6db8225c3 SHA-256: 8726f704dc3b7ab650d448debf4fed5d7bd951aa6f5b7f8bb90097fcad3ccf94
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 0.9990

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/123?utm_term=plain+collar+t+shirt+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456376/normal_604e804919786.pdfIn PDF document text
    • https://sixamipad.weebly.com/uploads/1/3/4/7/134726782/62c9a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407818/normal_604710584d6e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454168/normal_6059aab301354.pdfIn PDF document text
    • https://ditakusoboke.weebly.com/uploads/1/3/1/4/131437623/b25fe55ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381294/normal_5fc8b291d46d5.pdfIn PDF document text
    • https://diminulagiv.weebly.com/uploads/1/3/4/4/134489960/pixafim_botane.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414851/normal_5fe36eceae615.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4470542/normal_60b451686386b.pdfIn PDF document text
    • https://duvozeja.weebly.com/uploads/1/3/0/7/130739152/921668.pdfIn PDF document text
    • https://tajamexuzoxobug.weebly.com/uploads/1/3/1/4/131410736/rebede.pdfIn PDF document text
    • https://loxazofobel.weebly.com/uploads/1/3/4/2/134265844/nibinudozo.pdfIn PDF document text
    • https://sedapelagug.weebly.com/uploads/1/3/4/1/134109100/wirowedezid.pdfIn PDF document text
    • https://nolemidu.weebly.com/uploads/1/3/4/5/134584078/3fd7b9c741a95c0.pdfIn PDF document text
    • https://ziwirekow.weebly.com/uploads/1/3/4/5/134529616/5789581.pdfIn PDF document text
    • https://bewarovawizijus.weebly.com/uploads/1/3/4/4/134454629/1ce833.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467027/normal_60145fda860bf.pdfIn PDF document text
    • https://juramezuvuro.weebly.com/uploads/1/3/5/9/135956704/8aff8f4e60.pdfIn PDF document text
    • https://xetutimi.weebly.com/uploads/1/3/0/9/130968997/add5f18dbdc82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462696/normal_606b5a3b01e99.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/dd02d4b3-37b3-4b5d-9d63-c8adb647a852/stc_1000_hard_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11d96dba-c6f9-4f60-a92f-4565cb6543e3/are_sodastream_bottles_interchangeable.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11227 4964 bytes
SHA-256: f7beb0373e37a31cdba64556c8fa9da0826304088837689378abd90d37b5f81a
font_01_sfnt_off000122b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B7 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00012b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B45 10664 bytes
SHA-256: 157a8f969d1c9691b37239e5cc9df48906676dd09a3e05112272b4af42a71889
font_03_sfnt_off00014fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FDA 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34