Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fd046dc9ec16f0…

MALICIOUS

PDF

81.0 KB Created: 2021-04-05 01:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b1132cdbea8019eabe4ea8ab67833e4e SHA-1: 23c997b7e304841f10b6d901aeb0943f972531ec SHA-256: b5fd046dc9ec16f01f1ada61bc34bfe64e4304b9e111da9c952fa879fd2154b8
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://resalured.ru/123?utm_term=company+answering+machine+script PDF link annotation
    • https://redikuvemezu.weebly.com/uploads/1/3/4/8/134872152/3985276.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367632/normal_605aa66a2f15b.pdfIn PDF document text
    • https://xugirudubup.weebly.com/uploads/1/3/4/3/134332480/1acb9ebd73d7ca9.pdfIn PDF document text
    • http://iceteas.space/weed_eater_featherlite_sst25_carburetorbc2zr.pdfIn PDF document text
    • https://balikawe.weebly.com/uploads/1/3/4/6/134659528/ff591e1e8.pdfIn PDF document text
    • http://jonugofefo.iblogger.org/wodujuzominepugemem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412996/normal_606a30547ce67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374688/normal_606a3be626019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417418/normal_6031e07defc65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444647/normal_60224a67e889f.pdfIn PDF document text
    • http://verenica.net/freaky_paragraphs_for_him_yahoo_answers2xo9m.pdfIn PDF document text
    • http://minomesiguziv.22web.org/manualidades_alimentacion_de_los_5000_para_nios.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481065/normal_5ff7d92d35415.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420036/normal_60013ace79786.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rajusesozawan.rf.gd/semuwilofajujeromezeriw.pdfIn PDF document text
    • https://27475d5a-2981-497d-8cd5-0c310ef10f8b.filesusr.com/ugd/9cb927_357c1154ae944563ac21f3d683680799.pdf?index=trueIn PDF document text
    • https://97d49ff2-d914-4ae4-8ac8-5e5cf5f77cad.filesusr.com/ugd/6350c7_af03e0986f81405db3471e385e99fb1e.pdf?index=trueIn PDF document text
    • http://mowobamalopun.epizy.com/daruwerotunadunivetarelur.pdfIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_475db408835143e0b33f20cd56f015dc.pdf?index=trueIn PDF document text
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_f1ac0468fafa47298561e07d3aade68c.pdf?index=trueIn PDF document text
    • http://sobogasitizi.epizy.com/tibagojafirumokegali.pdfIn PDF document text
    • https://f3874c2d-c116-49c2-b7b6-9300dc8fc43e.filesusr.com/ugd/b11f6d_5c33f3754dc047bbbf99c92f2ec8705e.pdf?index=trueIn 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_off0000ee68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 5320 bytes
SHA-256: 84022d93bebae1a925fe39f090351c9098129f28b2450a92c53f2b5d167d84f3
font_01_sfnt_off00010068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10068 11308 bytes
SHA-256: 34dfe79690e411810a0db9522c21b7771ebef9f2212e95dd2517ff55112f8657
font_02_sfnt_off000126fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FD 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378