Malicious PDF — malware analysis report

Static analysis result for SHA-256 71bed8e9609b68e3…

MALICIOUS

PDF

76.9 KB Created: 2021-03-11 05:07:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6aaf17dab058e2e8d8fac15456f62df1 SHA-1: 48cff9d5c5125170cb51f1a74417b229beae8340 SHA-256: 71bed8e9609b68e3792e008f9d8023ab0587cbccc41b02844b859cf7be406cd0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary one pointing to 'ponafet.ru' disguised as a quality reduction tool. Heuristics indicate this PDF is a link farm hosted on disposable infrastructure, and ML classifiers and ClamAV strongly flag it as malicious, specifically as phishing or a trojan. While no scripts were directly extracted, the nature of the embedded URLs and the link farm heuristic suggest an intent to redirect users to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://ponafet.ru/award?keyword=reduce+pdf+quality+mac PDF link annotation
    • http://investorlands.ru/component_2_contextual_information_sheetwj4i5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471082/normal_600e32af2e626.pdfIn PDF document text
    • https://cdn.sqhk.co/bogofuvizibu/cqKgfha/togelebura.pdfIn PDF document text
    • https://vinatisuxuzelo.weebly.com/uploads/1/3/4/7/134770563/povetad.pdfIn PDF document text
    • https://cdn.sqhk.co/guzowozuk/hjijmjg/kabozoxafevetigopasa.pdfIn PDF document text
    • https://sefewazugep.weebly.com/uploads/1/3/5/2/135293251/b948b3b6b8e342d.pdfIn PDF document text
    • https://cdn.sqhk.co/wejawujagi/jn3ihic/download_lagu_alan_walker_faded_instrumental_version_mp3.pdfIn PDF document text
    • https://tonilawug.weebly.com/uploads/1/3/4/6/134652309/e354b9ce9ad8.pdfIn PDF document text
    • https://zudiwimuda.weebly.com/uploads/1/3/1/4/131438079/7b5f7d1b2fe8.pdfIn PDF document text
    • http://olymp-trade.top/cisco_ccnp_routing_and_switching_book06e3q.pdfIn PDF document text
    • https://zoredufuno.weebly.com/uploads/1/3/4/6/134638801/pifidu_lazojaronunakek_benunomitedumu.pdfIn PDF document text
    • http://mon-cmbretagne.com/concepts_of_programming_languages_10b1dnn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380411/normal_5fecc582389b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379606/normal_5fdbe2b6ca290.pdfIn PDF document text
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/3921917.pdfIn PDF document text
    • http://ionatr.space/7432460474o6uq4.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/iehiihE/bosorezuxixifesarigeluna.pdfIn PDF document text
    • https://konevolog.weebly.com/uploads/1/3/1/6/131606720/guxebeba.pdfIn PDF document text
    • https://mezuminekafowiw.weebly.com/uploads/1/3/4/3/134346911/sakigusaregatonovesu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481286/normal_602beecb3728c.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/5bae2c8f-25fe-45d8-9d83-42f93bb2712e/xumubanizeji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54c7dc23-345d-47be-b165-0dbae80fcb32/1357844367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a81be0a-4814-4170-a6ba-e4fd063e62f3/tp_link_hs200_wiring_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36c88820-fcc6-4e7f-9e72-6dca6d686933/nivumuvowanadaxokumazufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f034cba-5494-4ade-9c17-bbf99b0707a7/how_to_learn_technical_writing_skills.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_off0000ef6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6E 5260 bytes
SHA-256: c51e7cf8ff308843bda0183750f0f892ad4085872b0b448bdce92d1ccd2ac752
font_01_sfnt_off0001015a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015A 10796 bytes
SHA-256: 5302051dcdd9b1cbb0c5925e6cd3ed61f58ed945d02dda81bffd5b13c38b0d23