Malicious PDF — malware analysis report

Static analysis result for SHA-256 38523b8c01ddeaf0…

MALICIOUS

PDF

79.2 KB Created: 2021-06-07 02:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d6af012ec9aed24382132194b89bfe14 SHA-1: c103c0f3d1a07950608fd3c172268c3b7c0136df SHA-256: 38523b8c01ddeaf0c120f9f6443b777677c82749ebac0ac92eef996009f62b1a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to direct users to potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous URLs, including one with a search term related to software downloads, indicate a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=minecraft+download+free+download+pc+softonic PDF link annotation
    • https://pajilolupifi.weebly.com/uploads/1/3/2/3/132302794/sigedixomu.pdfIn PDF document text
    • https://neranoliva.weebly.com/uploads/1/3/4/2/134266014/d62eb9d0531c08.pdfIn PDF document text
    • https://mebenemezozu.weebly.com/uploads/1/3/4/6/134689881/febaxunebolade.pdfIn PDF document text
    • https://zapufotipo.weebly.com/uploads/1/3/2/7/132740892/ruvesivifedaxasukev.pdfIn PDF document text
    • https://vapatukubarokul.weebly.com/uploads/1/3/0/7/130739856/jamamisupibew.pdfIn PDF document text
    • https://kidivine.weebly.com/uploads/1/3/4/5/134576756/4d217b03e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373241/normal_5ffd7dbd5cec0.pdfIn PDF document text
    • https://simogewijak.weebly.com/uploads/1/3/4/6/134642120/tukukezenejawimirari.pdfIn PDF document text
    • https://zifereli.weebly.com/uploads/1/3/4/3/134347484/widatiga.pdfIn PDF document text
    • https://bipasomuted.weebly.com/uploads/1/3/6/0/136010989/59efb161a2.pdfIn PDF document text
    • https://tubomomumaxef.weebly.com/uploads/1/3/4/5/134508744/jutovixedudep_fopux_matemu_kidotanivizo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405419/normal_605c721a56b66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375083/normal_604acb812d573.pdfIn PDF document text
    • https://dilafunur.weebly.com/uploads/1/3/4/6/134697396/rateduwesu_dotize_juwogazuses.pdfIn PDF document text
    • https://rikadujijewebe.weebly.com/uploads/1/3/4/7/134726005/4086847.pdfIn PDF document text
    • https://xukutejupu.weebly.com/uploads/1/3/4/4/134487517/ba8408ab6b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pinurakus.pbworks.com/w/file/fetch/144637578/61312868669.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a3dadbe-8575-411f-a665-7f35c576d71c/how_to_measure_a_ring_without_a_sizer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f807021-5138-46a6-bc9b-80fa9b9ec561/what_is_the_meaning_of_indemnification_in_legal_terminology.pdfIn PDF document text
    • http://zobifel.pbworks.com/f/making_inferences_and_predictions_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b390da52-4013-47a1-9c77-092e933e55aa/reply_to_thank_you_email_from_supervisor.pdfIn PDF document text
    • http://sowenux.pbworks.com/w/file/fetch/144546252/nikiredijovo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/017c7def-7e7d-4824-a14b-452567e59ce1/what_are_the_examples_of_essay_writing.pdfIn PDF document text
    • http://pisaxolakek.pbworks.com/w/file/fetch/144720135/92110757345.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe8e905b-ca7b-44ca-9514-e3e9d24007b2/fusojosu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71E 5244 bytes
SHA-256: 20e6af8995a50f3969aa893c26c5afc459d0c06980990523aafa95051697d75e
font_01_sfnt_off00010923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10923 10528 bytes
SHA-256: 8adbd8508204865b633346737d8402cf77755ecd95da0f00414bf47a964850d1

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