Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f8d53041c84494…

MALICIOUS

PDF

91.5 KB Created: 2021-05-22 05:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5b11f82e1242267f332b0766830716ac SHA-1: 02f927ef975d06642f9428b22a1a5ca23f02ce80 SHA-256: 81f8d53041c84494bcdb6a68f1eaa901bb8ad85ffe955b40072955ed99e8c679
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external links, including one to `golowaki.ru`, suggesting a phishing or SEO spam campaign. The document body is heavily obfuscated, but the presence of external links and the overall heuristic profile indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/strik?utm_term=python+install+mpl_toolkits.basemap PDF link annotation
    • https://gipurafesab.weebly.com/uploads/1/3/1/6/131637457/875f2892ed1eb.pdfIn PDF document text
    • https://rowusebejaron.weebly.com/uploads/1/3/1/6/131637242/2598375.pdfIn PDF document text
    • https://wumigativagulam.weebly.com/uploads/1/3/1/6/131637174/fabugulovi.pdfIn PDF document text
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/bc0f28.pdfIn PDF document text
    • https://duvozeja.weebly.com/uploads/1/3/0/7/130739152/kaxewetenerev-somanamiruwukux-nomufafejuze-gusoji.pdfIn PDF document text
    • https://pisilobeko.weebly.com/uploads/1/3/4/7/134728547/kozuwojelaxulosij.pdfIn PDF document text
    • https://zoxusikajikad.weebly.com/uploads/1/3/4/8/134851315/kuvojupas_tedenawi.pdfIn PDF document text
    • https://lexedixejorew.weebly.com/uploads/1/3/1/4/131438453/5168367.pdfIn PDF document text
    • https://sawuwirepugasup.weebly.com/uploads/1/3/0/9/130969548/ripikusinu_lafujasog.pdfIn PDF document text
    • https://geregilewupune.weebly.com/uploads/1/3/4/8/134849809/bimuredaxozodu.pdfIn PDF document text
    • https://vajinivokesele.weebly.com/uploads/1/3/5/3/135326698/vuzitigogasuje_dalazosepamof_febezojiwe.pdfIn PDF document text
    • https://fodolazaso.weebly.com/uploads/1/3/4/8/134891373/wurame-nepivexitabora.pdfIn PDF document text
    • https://fuwozubasuzej.weebly.com/uploads/1/3/4/4/134473550/munirejiles.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/8669c1f9-87ac-45af-8a97-8ae208d67cea/how_to_create_a_smart_form_in_word_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbd086fd-e072-456f-89ac-be4961a17838/63384615799.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/300ea460-79dc-44d9-815a-4c99b53452b5/brute_lawn_mower_725exi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9eaa513-2d58-4f7e-892c-1f9572fadcd5/61941779655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0a80992-584c-4f16-ac22-e91017fb6bc1/ruxididudofabopolerudidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c6dd66a-fbb8-4220-9e82-810e19ce05b1/bovotajufaxeregib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d29c1131-ba24-4c03-9869-221262a8f169/vivijonapusetebalid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86cdbc2f-4245-4f3e-90ce-b0cfcf4fa1ad/redosalu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11283 5332 bytes
SHA-256: 63a74a768d3edd95e41ea2bb1f50709275ef038f94c51f299d2917d3d3f9b4a4
font_01_sfnt_off00012498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12498 11412 bytes
SHA-256: df080aad47093e2f4c59d065ce3dfce0217dfe1f51f1c443a19e20253b749f55
font_02_sfnt_off00014bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BCD 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7

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