Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1b7dba66f16f97…

MALICIOUS

PDF

66.5 KB Created: 2021-03-11 03:50:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: af085909c71e543f960679725e79458b SHA-1: dcedc0586604f60d487bf41d320b2eb5aaff7e1b SHA-256: 9f1b7dba66f16f97554ad4f087903b289669ac980f727f8c37cbe7db539340bc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to potentially disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or engage in phishing. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

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://fokemale.ru/award?keyword=attahiyat+dua+in+tamil+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443588/normal_601db0e59972a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378853/normal_5fd5fe6d861b7.pdfIn PDF document text
    • https://cdn.sqhk.co/vapezuwe/jfnhgjf/26486885444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380707/normal_6029719b61377.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/5gehiii/62532750845.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459180/normal_603868cc1c7ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428062/normal_602960cf7cd3a.pdfIn PDF document text
    • https://cdn.sqhk.co/salobosemiv/jFVgcig/77189805841.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411220/normal_601d3ba5e559e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410986/normal_603875dec6e94.pdfIn PDF document text
    • http://nopiwez.22web.org/archie_comic_books_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kiroxivox.epizy.com/15360345185.pdfIn PDF document text
    • https://s3.amazonaws.com/wupuxus/tejikuzivuvidazevowibo.pdfIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_baa6c06f52ed45b4bc404ba5d0531f2b.pdf?index=trueIn PDF document text
    • http://fudavifakafolid.rf.gd/simple_room_booking_system_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/5394450476.pdfIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_117fc67774b84e47a845fb259bb4f7f4.pdf?index=trueIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_08b0c3b663904e6dba6d6df500154645.pdf?index=trueIn PDF document text
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_c8b52e71811b498795e8f43c6f8851df.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B2 5100 bytes
SHA-256: 709fac060502c33892726cb2a10870042b1f4f9408172ef71b17dd6d8e5ecc10
font_01_sfnt_off0000d9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F4 10236 bytes
SHA-256: b1862f95cf82c4dea379333e2c7990612f8029f0e7349d4254f416de0eb5ed75

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