Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b7c30841bfb737…

MALICIOUS

PDF

69.1 KB Created: 2021-03-21 04:06:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a1cc1b6f35fabc53b3c80843b6f126c5 SHA-1: 92feaf6b81de53c55f29fbc81cb55d6f1b144512 SHA-256: a8b7c30841bfb737771936b3b77eb48bfd0d8126b429ec10a115daaf20f55fe5
184 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains associated with SEO link farms, indicating a potential phishing or spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing unwanted content. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=advanced+vocabulary+and+structure+practice+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421468/normal_5ff3c259d6575.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485572/normal_6056708a97924.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427528/normal_6024aced1ed4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454547/normal_6036a06c88ad3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486983/normal_5fcaa1a65312c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413108/normal_5fdbb4869b6e7.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/zowibatev/arduino_nano_usb_driver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fdf4539-1f38-4790-802e-993a2d22a9f2/what_happens_at_the_end_of_fight_club_book.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/internal_audit_manual_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/forms_of_id_for_employment_in_texas.pdfIn PDF document text
    • https://09d56968-2ae9-412d-ad86-e67dc63a1c23.filesusr.com/ugd/e8b91f_cdc7aff43b2a46238a3f5f666cfd631a.pdf?index=trueIn PDF document text
    • http://valavedazesosik.epizy.com/hydrothermal_carbonization.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/bodybuilding_motivation_video.pdfIn PDF document text
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_67cb6e23d4f149d09395e445ce0445f3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/20831ab4-19c4-4aff-85da-f0df0ce7c21a/why_is_it_called_a_dance_with_dragons.pdfIn PDF document text
    • https://1f49b3f1-4b09-4f89-88df-03804352fc9a.filesusr.com/ugd/a51aec_c0b84f0d61bb40498bacfdfc0c20a590.pdf?index=trueIn PDF document text
    • https://e41bb7a9-a35b-4578-ac27-1eab720d379a.filesusr.com/ugd/8912ce_403f465db4b941d697842fd437a60f29.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/49286ff6-9a6f-4f96-b270-89b34dbedc6b/fodirobedudikesakizo.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/weather_report_in_bangalore.pdfIn PDF document text
    • http://solazupusowisa.rf.gd/antioxidant_activity_of_nanoparticles.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01A 5440 bytes
SHA-256: 619b83ff2871dce0ebeee2422649776df40a2beaa801193c652dd7b308bb8ec0
font_01_sfnt_off0000e2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B2 10948 bytes
SHA-256: ce85ccd23012d82d9748f0ba15f9580567d2a807e1c2b43e69e1c7cc58e4487e

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