Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8e244638dce53f…

MALICIOUS

PDF

88.3 KB Created: 2021-06-09 22:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 72327f3c6deadab0c0814ab5169898e2 SHA-1: 219ef0986ddfde6395686b66586b26c1b76527ca SHA-256: 9b8e244638dce53fbdd6bd44cbbd12274a8e0fbaa45d6bd5c7a769e83ba85c24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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://krisoc.ru/pbw?utm_term=how+to+download+crazy+craft+on+xbox PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408323/normal_604895fedc40c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403565/normal_60c04989e2c5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413126/normal_5ff3e9e00dd65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450890/normal_605a38cc1c76a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386618/normal_60668e01a14d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481695/normal_5ff3161fcc92f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472484/normal_604a516f9b699.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://uploads.strikinglycdn.com/files/ad4183f1-1101-430b-8743-75954e3dad4c/dobujemo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c948cfc3-c7cb-4209-b166-de7afe0af42f/46808071520.pdfIn PDF document text
    • http://natizasex.pbworks.com/f/13184500531.pdfIn PDF document text
    • http://vikowezanipe.pbworks.com/w/file/fetch/144506100/63371814992.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56526299-2287-4305-a15a-90ebec9ea7b5/ginawoger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/347f971d-3284-4ed8-9697-de76ec53c9bd/vexani.pdfIn PDF document text
    • http://paditoxef.pbworks.com/f/is_john_wick_streaming_anywhere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/402904fc-69e6-4349-8043-0a3a3a2d8ff4/nordictrack_x11i_price.pdfIn PDF document text
    • http://negaboxa.pbworks.com/f/40520328271.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a81d643-07b7-41b0-ad44-e7b634c767ca/95271191808.pdfIn PDF document text
    • http://bopidix.pbworks.com/f/how_to_breed_vapwhirl_monster_legends.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/f/taxelifejijux.pdfIn PDF document text
    • http://kirozatijawu.pbworks.com/f/idle_balls_mod_apk_2019_android_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12c9126a-59b5-482a-802b-636c08bec09b/halliday_fundamentals_of_physics_10th.pdfIn PDF document text
    • http://midevodimu.pbworks.com/f/21497251293.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7c70d4c-dc0c-4a90-bc46-ecc519071d96/3864300505.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF710 4872 bytes
SHA-256: cae0e697fa5c763fa3ddd28d9f3008d359a28e0e99ee76d32a0ce16cec48e545
font_01_sfnt_off000107c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C8 11128 bytes
SHA-256: f59e1a6a30aef8ac7188704656bed85edb67b3f024e2da16895acbc64177d398
font_02_sfnt_off00012e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3E 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449
font_03_sfnt_off0001436d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1436D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3