Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c81cc2db1986a1…

MALICIOUS

PDF

88.1 KB Created: 2021-01-30 18:21:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 04dcfb794d527c4f62024a887721bd63 SHA-1: ec5c80b420b8d92e645531bc8e1bde011426b401 SHA-256: b8c81cc2db1986a1f8a153e5cbcb0edb9cd20edae73c80ee32cddb289b754a04
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as legitimate documents, indicating a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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/123?utm_term=algebra+1+regents+study+guide PDF link annotation
    • https://cdn.sqhk.co/ritasuxa/SigAihe/maroon_colour_meaning_in_urdu.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/hfTgiif/daxabezulebowa.pdfIn PDF document text
    • https://vonepegoparopew.weebly.com/uploads/1/3/4/3/134352316/ca5bf18.pdfIn PDF document text
    • https://cdn.sqhk.co/kesavaki/Cifvhej/world_warships_combat_mod_apk_revdl.pdfIn PDF document text
    • https://parafobosa.weebly.com/uploads/1/3/1/8/131857791/112ad9.pdfIn PDF document text
    • http://malapiwo.66ghz.com/button_disabled_android.pdfIn PDF document text
    • https://cdn.sqhk.co/lijusute/Zgdcoii/fixazubizujofefo.pdfIn PDF document text
    • https://xowozasa.weebly.com/uploads/1/3/3/9/133999953/5855254.pdfIn PDF document text
    • https://fanizoliboligom.weebly.com/uploads/1/3/1/0/131070566/mezifebu-denajus-ruzepogu.pdfIn PDF document text
    • https://kozewofedira.weebly.com/uploads/1/3/4/8/134899359/6555e174c.pdfIn PDF document text
    • https://xovirekines.weebly.com/uploads/1/3/4/6/134648888/625055.pdfIn PDF document text
    • https://sanokigoj.weebly.com/uploads/1/3/4/8/134863934/gotebedufuvuzi-nulizogixitujaf-memiwopi.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/fujuza.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://rubukemudug.rf.gd/cute_baby_kissing_pic.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/fortinet_fg-_80e_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/arcgis_enterprise_builder_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/manualidades_faciles_para_nios_2_aos.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/airdrop_android_zu_mac.pdfIn PDF document text
    • http://vafotuneg.rf.gd/vufofefalolefafilopo.pdfIn PDF document text
    • http://bunokupisosep.epizy.com/gomimosum.pdfIn PDF document text
    • http://fibubaxuvuvixik.epizy.com/mosobiwiwe.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_off00010b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B80 5048 bytes
SHA-256: 49b006eae7f762188527fe5ea80b9e362878f67a235b4bcc94144630d92a9a17
font_01_sfnt_off00011cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB3 11748 bytes
SHA-256: 7c0ee09e421bc9eaa07e35922b47a61df1c635fc9d6491719fb4d04fd35e654c
font_02_sfnt_off00014482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14482 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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