Malicious PDF — malware analysis report

Static analysis result for SHA-256 393fa48b8eb98054…

MALICIOUS

PDF

81.6 KB Created: 2021-04-06 05:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a2855cc4b39731f9880259cbd5c51138 SHA-1: b7519c8669f7a47147860cc1d00bd8068968dfb5 SHA-256: 393fa48b8eb98054dd15d127d9bb1ca65a7bdb678507bf5296dc154075388e9b
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs, many of which point to disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://soxebez.ru/award?keyword=exercise+book+for+writing+chinese+characters+pdf PDF link annotation
    • http://dalkomis.website/lipeb6o0li.pdfIn PDF document text
    • http://misefaditiza.22web.org/zuvonunimobowogere.pdfIn PDF document text
    • http://motirepefasake.iblogger.org/soapy_rides_car_wash_business_plan.pdfIn PDF document text
    • http://tovarzone.ru/kunorogizetagixfcl48.pdfIn PDF document text
    • http://ch-redirect.icu/boposoa7rcw.pdfIn PDF document text
    • http://bebarupeludif.22web.org/atlas_618_lathe_parts.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_b0692985d6e24944a45113b7c25acaf0.pdf?index=trueIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_5d81f34930ee45838f2d74a152cc9c9a.pdf?index=trueIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_166ffacb0032453c8c9633569df77927.pdf?index=trueIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_34d7d44a6f3b433a945c08fc2b86437d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c4cb58a-8607-4269-954b-282b54a43a6c/louise_hay_affirmations_love_myself.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3b94823-c1b3-48f0-83f7-3c0202171b52/modern_compiler_implementation_in_ml_github.pdfIn PDF document text
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_eb98e5bf3b2d48b0a15fcdf97f09f776.pdf?index=trueIn PDF document text
    • http://kipoluni.rf.gd/junuxipaderabonabapedijo.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_5d3f59e10bb24191b279ce164113e3b7.pdf?index=trueIn PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_e1f98b5f283d421aa5eafc1be01a7b21.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1a432bf-dbac-46d3-9cc8-13338b4b6edc/vivuniwuxi.pdfIn PDF document text
    • http://magajavopisili.epizy.com/what_playing_technique_is_featured_by_the_strings_in_this_short_passage.pdfIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_94a67328a88e48f7bb72a0eb14a33572.pdf?index=trueIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_000a725bccda4f56987fafed125ce827.pdf?index=trueIn PDF document text
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_451ee653bb9a48bbb4c23dd7a464110c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b634d07-0470-4bea-b797-3f0a489a3bb6/maytag_bravos_xl_washer_mvwb850yw0_parts.pdfIn PDF document text
    • https://4b523d79-2bc6-404f-8e52-0acae4d2cb03.filesusr.com/ugd/fe1b41_e36dba534e014081bceae3913b2c72f4.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE5 5704 bytes
SHA-256: 81f44c6b8b3d653cfc9ba45593d0a6b46b8e6a710e9ae7db9ff291eedbcb6459
font_01_sfnt_off0001136d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136D 10308 bytes
SHA-256: 51fd9d8a273b764381fb5ff3c31d21b066dabf3eb678a212a6efcda989eeacd8