Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd071938de8cf24…

MALICIOUS

PDF

71.3 KB Created: 2021-04-01 15:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: efaf020c22c6e0bc8ba2c3bafc026ffc SHA-1: 6fdf292f1cebd3340f8ae4bcebce8ff67a537af6 SHA-256: 7dd071938de8cf248ff337a4351bbef80e267327cacfb3d804e319b31fb41bae
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains associated with link farms and disposable hosting, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. ClamAV also detected this as Pdf.Phishing.Trojan. The primary purpose appears to be SEO manipulation or distributing links to other malicious content, rather than direct user interaction within the PDF itself. No scripts were extracted, but the structure strongly suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nipisod.ru/award?keyword=huckleberry+finn+oxford+bookworms+pdf PDF link annotation
    • http://lejidakoxinetog.mywebcommunity.org/69741816918.pdfIn PDF document text
    • http://azakalaza5.xyz/what_is_convict_labor_mean1sg0b.pdfIn PDF document text
    • http://storezone.info/gollux_prequest_guide_2020uho13.pdfIn PDF document text
    • http://dimopun.mywebcommunity.org/zubupupadovoxuxuxugopuda.pdfIn PDF document text
    • http://kosonetibekub.medianewsonline.com/barron_s_ielts_practice_exams_free_download.pdfIn PDF document text
    • http://jidapuxedepu.medianewsonline.com/felonatovupafumexalivuxuk.pdfIn PDF document text
    • http://giveaway2020.info/what_are_leader_competencies_armyzhw7r.pdfIn PDF document text
    • http://zitalogeloluwiw.mygamesonline.org/reading_passages_for_ielts_academic.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/materi_akuntansi_internasional.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_9d07bd3960cf4724b911de45f2b86028.pdf?index=trueIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_f3db62baf0bd4fe496f60fc7b46c55de.pdf?index=trueIn PDF document text
    • http://vejegaba.atwebpages.com/coordination_chemistry_bonding.pdfIn PDF document text
    • https://6680615c-3592-42a6-94f3-b98e474b5330.filesusr.com/ugd/252546_4f46b481515240f58710577550247cb2.pdf?index=trueIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_fe448da3968047bf9eb899dd911124db.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/graphs_of_trig_functions_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/rupinder_gandhi_all_song_djjohal.pdfIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_0fd8f1119bb74c6591cf9eb9230c9669.pdf?index=trueIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_85fac92745164afdb417f65f032db04b.pdf?index=trueIn PDF document text
    • http://jawuwibunoropo.atwebpages.com/area_of_square_and_rectangle_worksheets.pdfIn PDF document text
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_941d0283948b421d9fd676d73141aa3f.pdf?index=trueIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_e06bec7f05c946e2ae11bd5b4c037acd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liluvad/dotabuff_huskar_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/11753052175.pdfIn PDF document text
    • http://nununad.myartsonline.com/kokukufufabinamulizi.pdfIn PDF document text
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_941cd26ee989478a92c9967bcc29c536.pdf?index=trueIn PDF document text
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_a61cf2e9f24e4ed68e18a5bb5bee96a9.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B4 5516 bytes
SHA-256: 7e09bc0e9dffc4a8fea89cdae49dd8a899d0a9dbe887cebf99988868639fc11e
font_01_sfnt_off0000ea7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7E 10756 bytes
SHA-256: 19678902dff56a05983e2f520872a91de8fd2176b2ab077d0d2d2824e0fcd07e

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