Malicious PDF — malware analysis report

Static analysis result for SHA-256 327789366596d4ae…

MALICIOUS

PDF

74.8 KB Created: 2021-05-30 23:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7cac0d54d998432ad9490424cdc6e3cd SHA-1: 55474ff36cc35597714b14e2650f621699f83dc3 SHA-256: 327789366596d4ae641e3367cb86d1296211a51974125b9aa708677bfdbd1154
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 0.9996

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://botokaw.ru/strik?utm_term=tabla+de+equivalencias+de+milimetros+y+pulgadas PDF link annotation
    • https://gonadasefu.weebly.com/uploads/1/3/5/3/135345348/tipilonuluseru.pdfIn PDF document text
    • https://tujobofawoti.weebly.com/uploads/1/3/2/6/132695409/nixipasuvisavu.pdfIn PDF document text
    • https://gunoserikufetof.weebly.com/uploads/1/3/4/3/134360264/6877105.pdfIn PDF document text
    • https://kolenogu.weebly.com/uploads/1/3/1/8/131871799/zejesetoxaji.pdfIn PDF document text
    • https://tuxativavowaz.weebly.com/uploads/1/3/1/4/131437956/sabixajanexenonubu.pdfIn PDF document text
    • https://gogiwujuduk.weebly.com/uploads/1/3/4/3/134352159/mokozabawezo-suvepimofu-gubogufado.pdfIn PDF document text
    • https://mimejomukokije.weebly.com/uploads/1/3/4/5/134510045/siziduxuletamoxito.pdfIn PDF document text
    • https://pagejenaxupiwig.weebly.com/uploads/1/3/4/3/134383440/779490dae.pdfIn PDF document text
    • https://jaxefosizi.weebly.com/uploads/1/3/6/0/136083017/10df0ffe07b8.pdfIn PDF document text
    • https://kuxadolawemigos.weebly.com/uploads/1/3/4/7/134712866/0e0cb386a5.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/4dd54030-d34a-44ee-b3bc-9d7982c17d4d/56508198980.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb338da9-ec09-45f5-9425-b2ffc4f0c159/72368334113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97a74da8-83cc-4646-81d4-9a05e34a7812/subway_sandwiches_menu_and_prices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06da1fc9-3efe-4318-b2ad-e1d9c5e656d7/how_much_time_do_you_get_for_a_third_degree_felony.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79223e14-e4f2-4164-b53b-20191026648e/vowel_digraphs_worksheets_grade_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc430f7b-d1df-42be-993b-1c9d42801d81/do_washers_have_a_lint_trap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af0d7dc0-dd01-44c8-aa93-3fb0e1d637e9/what_is_the_best_barcode_scanner_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/289a0318-68aa-4101-8469-21fc17cebdd3/fesejog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70001e7e-bec6-4bc4-93f4-f3e3908df1fb/iowa_boee_license_search.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11948682-7a09-496e-b821-7c28268243ec/betojap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a067473-1c78-4d64-bdb6-bc76c7db9e03/revue_technique_bmw_k75_gratuit.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_off0000e334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE334 5768 bytes
SHA-256: fecc9f3c0b9210deeb57224ec7f9a19b5ab23f2b81123877db6fb1efed9f6091
font_01_sfnt_off0000f6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 11224 bytes
SHA-256: 8f06f02c0ebf627123981a6accdc94a1e3cb4cdc24959740bcfd609be719659a