Malicious PDF — malware analysis report

Static analysis result for SHA-256 07959861ec0c576e…

MALICIOUS

PDF

75.9 KB Created: 2021-04-02 22:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3efb4e6fb94932434fbfa97de1f390b SHA-1: 404fc0cf90ee59832d10653f9dc21e953a627189 SHA-256: 07959861ec0c576e0fc407c89cd6bf5d6132c463e7fa518676fdba7a56ae8575
96 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 point to other PDF files, suggesting a link farm or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and numerous external URIs indicate an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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://dafemum.ru/strik?utm_term=lego+star+wars+ideas+book+pdf+download
    • https://cdn.sqhk.co/bupitagalir/hfhczWm/shark_tank_tycoon_real_estate_full_episode.pdf
    • http://tunewejewuz.mypressonline.com/stop_saying_youre_fine_mel_robbins.pdf
    • https://cdn.sqhk.co/guwaloxipete/ddXjaij/nanuzife.pdf
    • http://sumigemag.mywebcommunity.org/livre_traduction_anglais_franais.pdf
    • http://vumajuzatijerak.getenjoyment.net/noselaboligaxal.pdf
    • http://solifixogalek.mypressonline.com/addition_and_subtraction_worksheet_grade_5.pdf
    • http://fejugutafilevin.scienceontheweb.net/57609206233.pdf
    • https://cdn.sqhk.co/nabixisaf/ihgjhdD/39409311635.pdf
    • https://cdn.sqhk.co/pudamunipum/iiiblia/65712117185.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wokesabisevo/vusimefokupobenerenem.pdf
    • https://s3.amazonaws.com/patotale/gift_box_templates_free.pdf
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_b6adc5679bab452f85a63e839e5a272e.pdf?index=true
    • http://fufudaloxola.onlinewebshop.net/bomiruxarunebokonivufisib.pdf
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_b8697c917cba4f97be7643a567c7142d.pdf?index=true
    • http://zagofij.onlinewebshop.net/essentials_of_pathophysiology_free.pdf
    • https://s3.amazonaws.com/banula/pagaxu.pdf
    • https://s3.amazonaws.com/xukanomarexumu/laminate_sheet_suppliers_near_me.pdf
    • https://s3.amazonaws.com/guxosa/dog_man_100.pdf
    • https://s3.amazonaws.com/lodazojamuva/54998583075.pdf
    • https://s3.amazonaws.com/zobuwubedak/wuvasoxi.pdf
    • https://s3.amazonaws.com/xisakazelelinim/vutetemakalofibutofor.pdf
    • http://vebagakid.onlinewebshop.net/subamevoxamosotakeluj.pdf
    • https://s3.amazonaws.com/jazuravazaguz/beparav.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e68c.bin
fdda2ff418959277625c4bd696c33eeaf8861d1affc547e1da8414df6b23e8d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE68C 5444 bytes
font_01_sfnt_off0000f93b.bin
c52febab30ffa9937d07a24ea96d2440e62abd8a921be399559999f3ab1d53a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF93B 12468 bytes

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