Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ea48c5a08920a69…

MALICIOUS

PDF

85.3 KB Created: 2021-06-12 12:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9ba8fa84bcc4e3671633ffedd7481d53 SHA-1: 5994f8635840abd2acbb216e0c2a6713fa869e1e SHA-256: 2ea48c5a08920a690330e8d94bde126473b6bab177c89fe2f810528b9bd0c072
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a mass external link farm, with many URLs pointing to disposable hosting services. The primary URL, "https://nomylo.ru/pbw?utm_term=can+i+use+my+apple+airpods+with+android", suggests a phishing or spamming lure. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nomylo.ru/pbw?utm_term=can+i+use+my+apple+airpods+with+android PDF link annotation
    • https://najonetawo.weebly.com/uploads/1/3/4/5/134522785/sesivimanegoraduje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445107/normal_60b8397e65790.pdfIn PDF document text
    • https://mereduje.weebly.com/uploads/1/3/4/7/134751500/jepofu.pdfIn PDF document text
    • https://lerizizevu.weebly.com/uploads/1/3/4/3/134314130/b91f1280.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451044/normal_60245493c7954.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408584/normal_6010d4ec08650.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374980/normal_5ff5b7ecf318c.pdfIn PDF document text
    • https://fetavagipiw.weebly.com/uploads/1/3/1/3/131380759/9ea74f5e08b.pdfIn PDF document text
    • https://mojabizozawobe.weebly.com/uploads/1/3/4/6/134699592/sagut.pdfIn PDF document text
    • https://gejovekozeja.weebly.com/uploads/1/3/4/4/134401956/0232857135092ee.pdfIn PDF document text
    • https://lenudigibelap.weebly.com/uploads/1/3/7/4/137499492/0161833904.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408471/normal_5ffcf283007df.pdfIn PDF document text
    • https://fenatafu.weebly.com/uploads/1/3/1/6/131637570/daba3cef3df598.pdfIn PDF document text
    • https://nutuvujupakumap.weebly.com/uploads/1/3/2/7/132740288/5828092.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/451a7e7f-9d72-47bc-98f0-f1af1696120b/7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/682bffea-db89-42ba-bf33-9a6a3e7c4a68/xinurobatokokumegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45e88823-3c0b-42a6-81ce-051182c703f9/descargar_libros_romanticos_juveniles_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa10f0d9-ca3c-4f06-bb75-2afefada1132/79101499376.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c521b8f-3973-4ff9-9aad-e30c0cc1fa77/43724215795.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1ccf95f-a264-4a83-9777-5c62af9af6de/37879825732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fee9e16e-bbcf-42e8-8b09-251fa5f61018/the_most_dangerous_game_movie_2020_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41db3bb1-1070-451a-8d23-4b2d80ad06a0/88013696514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40e9e1bb-19fd-4ad4-823c-e94bfcff8e64/is_the_harry_potter_series_on_amazon_prime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb115be8-615a-456e-87b7-db8650dc8352/7167675884.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_off0001105c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105C 5296 bytes
SHA-256: eb61a04b33f4d57c8c6dfd2f94511737281f9f37a3bdbfe7de990f093f240c53
font_01_sfnt_off00012245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12245 10984 bytes
SHA-256: 45a67913680664e985d01637384471d3d2d66073e8e8fcef048543081c9d1170