Malicious PDF — malware analysis report

Static analysis result for SHA-256 25bc0c79324225da…

MALICIOUS

PDF

91.3 KB Created: 2021-03-22 14:39:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 65cf0067f95ad15a8a078ca8cacaca51 SHA-1: 2e5d0bc20754e74e13aa763c800dc25af53a9dd0 SHA-256: 25bc0c79324225daced13f68b4d2da48d8ff24f0ad3ff826e85a7d69e99babe9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting it functions as a link farm or redirector. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/wix?keyword=ffbe+mod+apk+4.1.6 PDF link annotation
    • https://pemiliruvobavex.weebly.com/uploads/1/3/0/7/130739389/lekazifewilenefatide.pdfIn PDF document text
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/90e80.pdfIn PDF document text
    • http://spiritstudio.ru/ccna_book_for_beginnersnjvit.pdfIn PDF document text
    • http://hookup756.fun/gipaxoguwulapibureneberurxvrxn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494435/normal_600d41eb8b55f.pdfIn PDF document text
    • http://select-get.top/10038609903w7d6n.pdfIn PDF document text
    • https://mopebewugo.weebly.com/uploads/1/3/0/7/130776026/4943261.pdfIn PDF document text
    • http://titanof-filtr.ru/37351255006caj4w.pdfIn PDF document text
    • http://thehensleys.org/algebra_1_end-of-course_exam_practice_testf6cjn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490757/normal_602dd720d5199.pdfIn PDF document text
    • https://vemegerefawobe.weebly.com/uploads/1/3/2/6/132682093/vilif_demasaz_fubijave.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473651/normal_6007720769656.pdfIn PDF document text
    • http://gvidilon.ru/oracle_12c_sql_performance_tuning_guideodk3u.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/48a10ea7-3b40-4c7b-91c7-697dac88d76d/reviews_for_sole_e25_elliptical.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/035f4f57-85dc-4fdc-8d5c-2330fc967cb1/what_is_the_height_requirement_for_rides_at_disneyland.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5a26691-f124-4731-b326-fc3552d32c65/likirimanejuvizuzutuwub.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/what_is_the_difference_between_diamagnetic_and_paramagnetic_susceptibility.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/pneumonia_23_vaccine_information_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33d3614e-cf68-4252-bae1-991d2f837791/78462775612.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000129c1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x129C1 23220 bytes
SHA-256: a710be85e12f54cac1025daa4bb14b9306cead976d28876bd84630e4dbdbf356
font_00_sfnt_off0000e707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE707 2900 bytes
SHA-256: 5226c763f3d4f3cbceb38bcb13217c6b3d4a8982263ccab1e51df51dbcfe70e9
font_01_sfnt_off0000f15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15C 4920 bytes
SHA-256: f10862b0a06f871876b09d40c3c31608790926277a6487f320d3f01ddfe2c4a2
font_02_sfnt_off00010232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10232 11608 bytes
SHA-256: b1ed16893c3776f8bccc1a9de7445631afdcde112816148e40cda512ea9c5625
font_04_sfnt_off00015148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15148 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e