Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1e079b5a1f1c6b…

MALICIOUS

PDF

74.2 KB Created: 2021-05-22 08:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0cd5ceb9b3986fa124c0c687e5923e16 SHA-1: 9b1b41e2fd5abd8d45df40668939a2ef8252a2e3 SHA-256: 9c1e079b5a1f1c6bf2abc87010685930e0762f3673d77ff8ec09ec1dec7c3f4e
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 hosted on disposable domains, which is characteristic of a link farm designed for SEO manipulation or to distribute malicious content. The primary malicious URL identified is https://resalured.ru/strik?utm_term=flight+sim+2018+unlock+all+planes. While no scripts were extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/strik?utm_term=flight+sim+2018+unlock+all+planes PDF link annotation
    • https://xizanubafawadug.weebly.com/uploads/1/3/4/3/134321303/jipajitelobaledolus.pdfIn PDF document text
    • https://bevizopet.weebly.com/uploads/1/3/0/7/130776142/dinemupagazajegef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378853/normal_5fddbccd5b31d.pdfIn PDF document text
    • https://siraxaroxaran.weebly.com/uploads/1/3/1/4/131483069/nasisufusukolu.pdfIn PDF document text
    • https://denafeferigo.weebly.com/uploads/1/3/0/8/130874231/lememumiwila_nakuvolaki_nitabamozune.pdfIn PDF document text
    • https://wekegakusujesal.weebly.com/uploads/1/3/4/2/134266445/9343824.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427821/normal_5fe4197d9ed37.pdfIn PDF document text
    • https://kabirajozef.weebly.com/uploads/1/3/2/7/132740353/xapotisu.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/ac28fb7e-6756-4684-9929-df81c1f68ae9/what_are_two_examples_of_effective_communication_in_a_romantic_relationship.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/286980eb-c1e4-4431-b4e8-5ecc3bf3be97/is_1920x1080_the_same_as_1280x720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebee8e19-4c90-4085-a8c1-4b8418a34a3c/jizediwegat.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/what_does_wgn_stand_for.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4f8e88e-ebe2-4901-b1db-ed6fbe00fea4/why_would_you_smell_like_maple_syrup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c10f502e-18ee-4ea6-a749-066e45f2c8da/domewatekikij.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/lekogelus.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/beginning_sounds_worksheets_preschool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df094eeb-2589-4631-a02d-497ca130e317/31780654864.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_off0000e2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D9 5788 bytes
SHA-256: 5243d1aa86765861758c0564dfc389f60c18ff85927902b573e3f7269dd58418
font_01_sfnt_off0000f67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 10924 bytes
SHA-256: 8c7128a76b3042baa8cab664d6d08039594bb77c3f2d663bbacda582f908746f

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