Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c82c77064311437…

MALICIOUS

PDF

72.8 KB Created: 2021-05-09 21:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f918be791d3cde1db68093231336ad2d SHA-1: b2a36534ff6768989a0aacedd8b1ca5668331ccc SHA-256: 5c82c77064311437d4c05d5cddee4e025eb1eaf04d0ec8ad4d241037059b6465
156 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 0.9997

Heuristics 5

  • 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.
  • 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://zajinet.ru/strik?utm_term=small+engine+repair+school+nj PDF link annotation
    • https://cdn.sqhk.co/sixitigoxeto/RLhd6ha/balance_of_payments_accounts.pdfIn PDF document text
    • https://cdn.sqhk.co/dewavasese/hgf2mhg/woodbridge_apartments_wylie_tx.pdfIn PDF document text
    • https://cdn.sqhk.co/livoluxuwad/EChhhtm/jodie_s_burger_shoppe.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/1hbR5Kw/33310442748.pdfIn PDF document text
    • http://ribavid.medianewsonline.com/84523489158.pdfIn PDF document text
    • https://cdn.sqhk.co/sejujona/ja7icTU/86144675615.pdfIn PDF document text
    • https://cdn.sqhk.co/kapideto/gchjjdl/dungeons_mod_for_mcpe_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gixeruxa/ggPhjii/77853728922.pdfIn PDF document text
    • https://cdn.sqhk.co/nenuguvan/gkgeBf4/octopus_garden_weaverville.pdfIn PDF document text
    • https://cdn.sqhk.co/rasetiwulipu/hiXX7xf/flip_flops_womens_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/pexudolifa/JHvibjj/37891199006.pdfIn PDF document text
    • https://cdn.sqhk.co/pobopuwubox/ig7Xuhg/fejinuzuz.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/AghVfhg/jowawudi.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/hjTIghc/poblano_sauce_torchy_s.pdfIn PDF document text
    • http://robugipunebib.mygamesonline.org/jaworirivozokiwodowunu.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/ijSibjh/96949509212.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/VWidzjg/cnc_drilling_parameters.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fojakosi.atwebpages.com/24276203168.pdfIn PDF document text
    • http://firiwigisu.atwebpages.com/rawaranudopuwanugeforafof.pdfIn PDF document text
    • https://0108a07e-94d6-443d-bfa7-575dd38852ad.filesusr.com/ugd/756a01_2a5096e607b84d7fad670ffebfededc6.pdf?index=trueIn PDF document text
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_f33071a28c1a4c66a95e13e6c3cd12b0.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_off0000de51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE51 5528 bytes
SHA-256: baeb818375933a6488129a50cd5a0df3afc6735774f7efc63777f830289bf630
font_01_sfnt_off0000f0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EA 11012 bytes
SHA-256: 669d961c0b0db52fa5a1db100671c367368eac690d0c1e516401150cdf00e717

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