Malicious PDF — malware analysis report

Static analysis result for SHA-256 57969f63597517b5…

MALICIOUS

PDF

72.8 KB Created: 2021-02-12 12:19:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 01d20a9e71f74e1c30a3210a9fb34846 SHA-1: 3b2fb09cdd0eceed0bb7b48f36cf0918900f7d9c SHA-256: 57969f63597517b5f25a480736616b51672acb3e77764c05a0673d7e2cde8063
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, with the document likely serving as a lure to a malicious site or to distribute further payloads. No scripts were extracted, but the presence of external links and the heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://bologen.ru/wb?keyword=funny%20questions%20and%20answers%20for%20adults PDF link annotation
    • http://ridunculus.com/wototapopewepuzeselnwn.pdfIn PDF document text
    • http://com-connexion.xyz/35167445955uf7qv.pdfIn PDF document text
    • https://cdn.sqhk.co/gederanew/iZf6SLa/boguz.pdfIn PDF document text
    • https://xusopulude.weebly.com/uploads/1/3/1/0/131070786/butaxotupotus.pdfIn PDF document text
    • http://levupag.22web.org/transformer_investigatory_project_class_12.pdfIn PDF document text
    • http://adyga.site/vr_wing_chun_trainerqh82j.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/hjjjeeL/pazasiboxepevel.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/2jd9hd6/17891480913.pdfIn PDF document text
    • https://xotogifove.weebly.com/uploads/1/3/1/4/131406695/2d2c91f8.pdfIn PDF document text
    • http://kinoxca.xyz/gututazoxr199.pdfIn PDF document text
    • http://shopbest.online/broadsheet_hobart_2019rxwr7.pdfIn PDF document text
    • https://cdn.sqhk.co/junigofulum/oPjgieG/zorosakebajafeb.pdfIn PDF document text
    • https://cdn.sqhk.co/pomorezolo/jsgggee/42693617856.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
    • https://s3.amazonaws.com/gelawiweza/eine_kleine_nachtmusik_piano_duet_sheet_music.pdfIn PDF document text
    • http://pimorem.epizy.com/adobe_suite_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/wakogasoxexakiwalejato.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/19662904187.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/zugekozokerezodisibuwopa.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_off0000d467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD467 5060 bytes
SHA-256: fe9a6283b08107a7143744afed15aa472c9708c2667b346267683e753b2dd10a
font_01_sfnt_off0000e5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BA 9972 bytes
SHA-256: f7c1d1ad193e6ba9800661e0fc834ccb1f7364206487479456f061924e285fad
font_02_sfnt_off000107ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EE 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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