Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ce50308b232acb…

MALICIOUS

PDF

78.0 KB Created: 2021-03-11 14:43:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4ac0fabc1208514f5447040b43924c9f SHA-1: d820096a543a8c66897e8b77331d8c51a5638659 SHA-256: f1ce50308b232acb63b857e945f124ec69ebe24c25c541704cada7d4e238af0c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://midufefew.ru/strik?utm_term=rainforest+jumperoo+fisher+price+recall PDF link annotation
    • http://fijexojor.getenjoyment.net/14586454269.pdfIn PDF document text
    • https://fagozozefixus.weebly.com/uploads/1/3/4/8/134846406/6a9ca042ac063d7.pdfIn PDF document text
    • http://serururepus.scienceontheweb.net/modal_verbs_exercises_advanced.pdfIn PDF document text
    • https://bovitala.weebly.com/uploads/1/3/4/4/134497817/48f590c02aea1d7.pdfIn PDF document text
    • http://tenipimutav.mywebcommunity.org/gokasid.pdfIn PDF document text
    • http://sitizinudex.getenjoyment.net/rotabewodagasa.pdfIn PDF document text
    • http://wiwuwanulujero.iblogger.org/ruxiziwudodol.pdfIn PDF document text
    • https://zugozoriv.weebly.com/uploads/1/3/4/7/134770463/5213174.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/97c0880a-7818-4c98-a570-54b0ee0362a6/philips_shaver_series_9000_trimmer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fe88b6c-b4eb-47bb-b9da-8fb7aba2a3f6/pesigozugevonog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0f2638b-2c2a-4d20-a776-da4dc1e03e8d/how_to_use_ocd_pedal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d96a2686-1869-4106-ad61-1b4a696b343c/1248330530.pdfIn PDF document text
    • http://boxitevu.rf.gd/troy_bilt_storm_2840_parts.pdfIn PDF document text
    • http://tiredosutozol.atwebpages.com/how_to_clean_ge_profile_microwave_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e741a00-d89b-4543-9bc8-76292520fdf7/topinomofom.pdfIn PDF document text
    • http://mojozore.myartsonline.com/lunafodakizijudalulipebat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28e581e6-b93d-413c-abb4-b0a86d587eb3/answer_sheet_template_1-50_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b77864d-cdd9-4cf2-a000-7f99cce83f0c/pasasojunenezifi.pdfIn PDF document text
    • http://vupaguriwedizid.atwebpages.com/ar-15_manual.pdfIn PDF document text
    • http://lizaduguxo.epizy.com/76508660188.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_off0000f044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF044 5340 bytes
SHA-256: ca2d76346884735ccebc1c2da3eaf977754f31c4c36a1f88dff7a5b77ecd8c90
font_01_sfnt_off0001024e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024E 12648 bytes
SHA-256: edd17f195f80447c67e045fa2dc6750f7aed205a486e5a522de3c5bd67e2af77

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