Malicious PDF — malware analysis report

Static analysis result for SHA-256 65644e77a4e2267c…

MALICIOUS

PDF

97.1 KB Created: 2021-04-01 00:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 004f3d03bdc87b68afc6d9b4be6ae063 SHA-1: 7bf2e9607edc7b96675dd6edb2cf4476f8aa22a6 SHA-256: 65644e77a4e2267c36747a97e0e9674cfcc8a98c0b6864b920f16ea7e55e61fc
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to 'https://druttle.ru/award?keyword=agile+scrum+master+book+pdf', suggesting a lure for users interested in Agile Scrum Master books. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious content, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • 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 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://druttle.ru/award?keyword=agile+scrum+master+book+pdf PDF link annotation
    • https://lawejuja.weebly.com/uploads/1/3/0/7/130740077/kugevu-joragorovi-jiparujap-nesagijut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460231/normal_6001eec9a57ca.pdfIn PDF document text
    • https://cdn.sqhk.co/fowujizul/bmhj1hi/hide_and_seek_online_y8.pdfIn PDF document text
    • https://cdn.sqhk.co/bataseset/ztSgcij/whispering_oaks_ranch.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457572/normal_5fe546c2b7b04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403262/normal_5fd8cad77abe9.pdfIn PDF document text
    • https://kofekatemate.weebly.com/uploads/1/3/2/8/132815318/wosotapedeporup_bipopezikom.pdfIn PDF document text
    • https://zorovapi.weebly.com/uploads/1/3/2/3/132303286/rigalaka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445321/normal_601ad1be1fac1.pdfIn PDF document text
    • https://jimekomu.weebly.com/uploads/1/3/1/4/131453536/8cae52fec1.pdfIn PDF document text
    • https://cdn.sqhk.co/mojupesonon/s7iefiw/kazejokefatatewepeduniw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373757/normal_5fccd93fa3e57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443799/normal_600488ce092a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485434/normal_601a474946212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421474/normal_602802c913721.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/bloomberg_terminal_beginners_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fba2e6e2-fa70-4a69-a10e-96769753b805/kesuxariti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72e22aab-ad32-4bdb-b18f-08c8568e3eb7/vekafumaxudop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27dd8cba-bd1f-4a0d-bb8a-dd80fa7d332c/what_are_effective_communication_skills_in_nursing.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/83275961143.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bc34c24-608b-4a27-8e3c-38f039a84506/how_to_lateral_in_madden_18.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c9686eb-8179-4f85-9694-471480324b86/75784832008.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/64409463474.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/poduresutenebix.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000134fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FC 5668 bytes
SHA-256: 7900d2e8c415c7c8452285937f8c8cd49e05888c8db13a23c5f200cc41a2d0a9
font_01_sfnt_off0001482b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1482B 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off000150b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150B9 10948 bytes
SHA-256: 07e04fcc42c9b4fbd73c15d94a4ac97e182c9c6bdc241e4d26a427e3d9171ac1