Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a6499af6aa1f4a…

MALICIOUS

PDF

80.6 KB Created: 2021-03-20 21:05:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: c17565bf3cadb05509c7d6b84695b516 SHA-1: b71254260b919d03b460b186ca043e5dc0deebb9 SHA-256: 38a6499af6aa1f4ad04652468d57ce7a4ec24946e303dfab39a9881a5e27fb53
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector, and another identified a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=que+son+las+bacterias+mesofilas+aerobias+pdf In PDF document text
    • https://pawomasa.weebly.com/uploads/1/3/4/7/134737305/zawulegudewasibixugo.pdfIn PDF document text
    • https://gopaxabog.weebly.com/uploads/1/3/5/3/135309926/fiwefebuvumiguv.pdfIn PDF document text
    • https://sefadibewotova.weebly.com/uploads/1/3/4/0/134018483/fuzepabedutubi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pobixedele/zexurejikukatuzixu.pdfIn PDF document text
    • https://234a0c07-d908-4261-bb83-16b3c96a9b04.filesusr.com/ugd/73e0e6_7f6dba8354c84b85ba89c85b7f0c9d44.pdf?index=trueIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_97042f5c0e5f4c3eb8f4aa15165ed520.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/31d0b7ea-624d-4077-8397-15421469c135/98992173074.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/gazuzorisofovakiwipil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87c359fd-f92f-4c2c-bf76-5c640df6246e/savers_meaning_miracle_morning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/201997b5-5794-4188-ab38-c96e56ffb661/82581448953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2be5c3af-3992-4353-bcf5-1e4cd8045cdf/63129688612.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be3177eb-c8ce-4206-b9f0-8330768c86a1/49266172901.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/6449012042.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/star_trek_discovery_season_3_episode_2_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e51f90ab-48a3-417e-8e4a-d91c07c0c488/52933810069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e699b37-183e-4976-a8dd-ead8e6b681b7/75595040742.pdfIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_85df7672039e4a0194b31a97fb7b9a92.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/31d36e82-2747-4d1b-842c-87df6b520da3/61348086352.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67D 5504 bytes
SHA-256: 2104636ca56456da737ad1d22c6900554af5f42d65ed85249488cc3575d0c1a8
font_01_sfnt_off0000f912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF912 11096 bytes
SHA-256: bccfe1cc1e48bc400c9a4a357a927b96e265ee926afcd854e44705894a205d93
font_02_sfnt_off00011de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE0 16136 bytes
SHA-256: 8d0ca5441952925faa6f68d28470995fcd5e3edd800b1977fac83179433ae1db

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