Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38436d2ad1210d4…

MALICIOUS

PDF

89.1 KB Created: 2021-04-03 13:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 671106b1c25215964d15c9ff7287a526 SHA-1: 81be66d0ffa27e480a82ab7c27a946a031370158 SHA-256: a38436d2ad1210d4dd8d23dbd260db065745f0fcf02e9a4300a342820d9540e6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and a high heuristic score from ML and ClamAV indicates malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'translations on coordinate plane worksheets pdf', which is likely a pretext to drive users to the malicious URL. The presence of external URIs and link farm heuristics strongly suggests this PDF is designed to redirect users to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://xezojetit.ru/award?keyword=translations+on+coordinate+plane+worksheets+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365662/normal_60342ca980ecd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448347/normal_5ff8170fb989c.pdfIn PDF document text
    • http://difodalutovirub.iblogger.org/neon_pink_acrylic_sheet.pdfIn PDF document text
    • http://nowatora.22web.org/94147681123.pdfIn PDF document text
    • http://jizefuli.22web.org/78043408380.pdfIn PDF document text
    • http://wutanitof.22web.org/30828525.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468836/normal_5ff3f7309faf4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417653/normal_5fccb5896f6a2.pdfIn PDF document text
    • http://wasodez.22web.org/kuxujipanexofupaja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_4e56d4d281df4429922194d3360ff9b0.pdf?index=trueIn PDF document text
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_6b4766e2ac8045e183e284e51fba87fd.pdf?index=trueIn PDF document text
    • http://mutidulofof.epizy.com/dalwood_spelling_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9060462-4ac3-4660-b401-12b51bac3a5d/does_god_want_us_to_celebrate_christmas.pdfIn PDF document text
    • http://dejogamolefip.rf.gd/sumabozibemolaju.pdfIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_fa23afae7a4848519cc36c800e08a141.pdf?index=trueIn PDF document text
    • http://zanofifaluli.epizy.com/66592668116.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aeaa39d-ec9a-45fa-a836-961826075fc9/kubeledonosovod.pdfIn PDF document text
    • https://5c06e36d-e6a7-492f-989e-88f86e9ca1b1.filesusr.com/ugd/c9ae65_837d07bb55254cfc8bf6b0c74fd51d61.pdf?index=trueIn PDF document text
    • https://8b62b971-d575-4461-ae89-9de7a2afac08.filesusr.com/ugd/c5a911_28de4d6121064d91a7f204ee25307b3d.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB37 7656 bytes
SHA-256: 460e5de4ffff907b273b69d1b5eff67cdeef7e1e9cd11ac100999d09fdc725aa
font_01_sfnt_off0000ff14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF14 2912 bytes
SHA-256: f1585241b59a1002e627af24859d8bddc2a41f5101ead6a7a290360bc82d6b36
font_02_sfnt_off00010979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10979 5348 bytes
SHA-256: 53c5d10f2d89f8ecdc44f52728cc2b69208759621fd2a66921868045d2631d65
font_03_sfnt_off00011bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB3 10892 bytes
SHA-256: d7536842a42073bc97c089d5dee57af4986c8be4d446cb09905fcc664ff2f2a8
font_04_sfnt_off00014129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14129 16076 bytes
SHA-256: 1621a87b6bc266bc0e3d5871723ec36fa76dd6d2c9fb76f212020cc469043148