Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f77280eff8c8c8d…

MALICIOUS

PDF

83.8 KB Created: 2021-03-18 16:53:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41071694a25d260c8bffc36e1728eac0 SHA-1: 05b1b0a3c29cf02a47fa1bf53426f2bfda7c211c SHA-256: 5f77280eff8c8c8d301d26193bf521dd5aa8c9df79ef80fe61d4283cb7d84c11
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://resalured.ru/123?utm_term=tartil+quran+surat+al+baqarah
    • https://tufulikuzusader.weebly.com/uploads/1/3/4/8/134866114/6209009.pdf
    • https://midumelu.weebly.com/uploads/1/3/4/3/134341446/lodinola-motebevufujiliw-negojuguwewijez-gizemokojinad.pdf
    • https://cdn-cms.f-static.net/uploads/4491437/normal_603d28f185f90.pdf
    • https://static.s123-cdn-static.com/uploads/4404964/normal_600639c993481.pdf
    • https://static.s123-cdn-static.com/uploads/4421781/normal_5fcc8c8b0f75f.pdf
    • https://metesanej.weebly.com/uploads/1/3/1/8/131858044/2d9fbf5222.pdf
    • https://cdn-cms.f-static.net/uploads/4388282/normal_604361982ea08.pdf
    • https://bekodezu.weebly.com/uploads/1/3/1/8/131856725/2978632.pdf
    • https://static.s123-cdn-static.com/uploads/4374177/normal_5ff773073fe3e.pdf
    • https://bodarisijusafu.weebly.com/uploads/1/3/5/3/135383154/3f5a0d4e98e05.pdf
    • https://lufufalab.weebly.com/uploads/1/3/4/6/134634403/4114178.pdf
    • https://solakozejifu.weebly.com/uploads/1/3/5/3/135347449/c8520c5036.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ffcaff73-c5a4-431b-ba4e-e991a9f00dd7/survival_skills_training_nyc.pdf
    • https://uploads.strikinglycdn.com/files/6cb5a73b-3dff-4e8b-86ec-31a709a33d7d/garakunedufunusipajot.pdf
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_495e54480b754596a2d56b1793496c16.pdf?index=true
    • https://uploads.strikinglycdn.com/files/337563f1-e80b-4822-a31e-58d975e72048/how_to_design_your_own_3d_print.pdf
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_30b780dce3c343a1ab08143e91bbe3c1.pdf?index=true
    • https://adc67df4-9ac4-4169-8225-f8d60376216a.filesusr.com/ugd/a1c2c7_9204d00f75c34ca4a2ee34d5ea72a889.pdf?index=true
    • https://s3.amazonaws.com/jevopemosod/28129690021.pdf
    • https://s3.amazonaws.com/vebisop/jam_transit_mini_buds_not_charging.pdf
    • https://ca483b97-61ac-4196-bca0-6b249c18eca9.filesusr.com/ugd/b27199_b90651fb8cd34082adf555f5a38c9f15.pdf?index=true
    • https://uploads.strikinglycdn.com/files/233f359f-422b-4dd0-8533-aa0496f87c4a/conflict_management_techniques_relationships.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_off00010cff.bin
213e1b91d2476238e163ba3cf65c494e9ffd75a197273463562ba9f1979ec050		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFF 4988 bytes
font_01_sfnt_off00011de8.bin
6cd48d483dbc3d6b81a7b12bd1a698c47cab34c42565a7256579776f0e07e7b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE8 10500 bytes

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