Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b2ef3009ad2cb1…

MALICIOUS

PDF

86.7 KB Created: 2021-04-06 14:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 748e8aa41f2d163c810478cf408672dc SHA-1: c9378ce98feb5fc2ebfb334e8e123e65dc7a4423 SHA-256: 36b2ef3009ad2cb1a74c4e88a594bec5fb15649826361ae60bc01a0c7f281e92
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one prominent URL leading to a suspicious domain that appears to be part of a link farm. ClamAV and ML classifiers strongly indicate maliciousness, specifically phishing and trojan activity. The document body, though heavily obfuscated, suggests a lure related to a chemical formula, likely to entice users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/wb?keyword=formula%20molecular%20%C3%A1cido%20sulfurico
    • http://jasazotinalol.mygamesonline.org/anatomy_of_gi_system.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_9d881a0572e54310aaa1a6b1705174d2.pdf?index=true
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_b7bf26ef5e4a48858e633d02b3821cc0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/49814276-8ae0-4238-86e4-e6490352d5b4/wazipixubirikivi.pdf
    • https://s3.amazonaws.com/wudibirewuduto/virososa.pdf
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_dc7d339be75e49c2bdc05a5a3f8fc851.pdf?index=true
    • http://kutoxinupuroxo.onlinewebshop.net/arithmetico_geometric_progression.pdf
    • https://901b9152-9067-49c5-8541-bb90c1a77dfa.filesusr.com/ugd/5d84e8_3095cea6c0e64e8c94e476a5c5c8219c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/26f9b304-3067-49f0-bebd-77cbc402c665/99638081997.pdf
    • https://uploads.strikinglycdn.com/files/eb6cd8fa-a433-4af9-9c9e-c0fbd1041a76/84952943293.pdf
    • https://uploads.strikinglycdn.com/files/288d01ca-a801-4d27-9a4e-91e102687466/furuzev.pdf
    • https://uploads.strikinglycdn.com/files/b0a3ad94-9cb3-4ddc-8d4c-05b457de39ea/xenesa.pdf
    • https://s3.amazonaws.com/laginekux/penn_foster_electrical_exam_answers.pdf
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_6f882056e4c74930a4c337acf81e6bc4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5afce995-2d9c-4325-989f-1c9fa35cdea1/amantes_del_desierto_capitulo_36.pdf
    • http://kavibajegis.onlinewebshop.net/cuisinart_cpc_600_series_manual_espaol.pdf
    • http://wojibikifi.myartsonline.com/30074535008.pdf
    • https://s3.amazonaws.com/wizakokowe/76475501261.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6be.bin
8c147b51d3aadc089d978d7c2382c163fb134f13e9ab4edb4a160575cca50168		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BE 5356 bytes
font_01_sfnt_off00010851.bin
02e95bfca70fee635b1c3352b46d728c38f09261dfadb68677ad9eea07ad9ec0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10851 14596 bytes
font_02_sfnt_off000135c4.bin
a6cd89e0578220451ad5443878acd29f7a4459d9f7a2fea4a00d6cac4779ecf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135C4 16260 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.