Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b28ed59c41c0c8…

MALICIOUS

PDF

85.4 KB Created: 2021-03-16 19:57:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab3f726cbc5abe2fa849376a50d110d5 SHA-1: 68712f91f4b49d2bbd805a64f4476f64e0635d20 SHA-256: a9b28ed59c41c0c8e46947c3ba25dc0e3b8bd16a5f2d86adeea403b5d090be77
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, detected as a link farm, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/123?utm_term=druidic+ritual+guide
    • https://zevexeduj.weebly.com/uploads/1/3/0/8/130874566/acadd13.pdf
    • https://laxomubidaxudov.weebly.com/uploads/1/3/4/4/134475580/4ad692f4.pdf
    • http://lalojit.iblogger.org/adverb_rules_in_english_grammar.pdf
    • https://vumamoxaku.weebly.com/uploads/1/3/1/3/131380777/90a3c078be.pdf
    • https://nebuxegakox.weebly.com/uploads/1/3/4/4/134404726/8251813.pdf
    • https://dadotetixaj.weebly.com/uploads/1/3/4/4/134404583/791fe09.pdf
    • https://nawenakugod.weebly.com/uploads/1/3/6/0/136048640/175d189aed971ef.pdf
    • https://gebonevoduxap.weebly.com/uploads/1/3/1/6/131606392/d48098b0.pdf
    • https://lexeponin.weebly.com/uploads/1/3/1/8/131856664/b1fee340094b.pdf
    • https://sipedevesebin.weebly.com/uploads/1/3/4/8/134879103/92a4f64af3f.pdf
    • http://mixatapiwaleni.22web.org/vodufaketujuwunenabi.pdf
    • http://josebixotarez.22web.org/luxegufako.pdf
    • https://fudegedetet.weebly.com/uploads/1/3/4/7/134733785/mawimodenu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wetovokerug.epizy.com/23648407247.pdf
    • http://fabupumow.epizy.com/echo_srm_225_string_length.pdf
    • https://uploads.strikinglycdn.com/files/cf334612-7428-4700-922f-fccc07377336/dafogixegapup.pdf
    • https://uploads.strikinglycdn.com/files/323ce31b-0107-4238-9892-96c9a4e96084/darezuwutolujezeguxigizog.pdf
    • http://livewimujekofo.rf.gd/sigawuvetikikez.pdf
    • https://uploads.strikinglycdn.com/files/66bcc16b-2753-4886-9b22-68a4c6df12d2/35414870605.pdf
    • http://punexowimuseva.epizy.com/nobasewurasigopan.pdf
    • https://uploads.strikinglycdn.com/files/5511a687-b1d3-4768-8526-aa1f3a587c38/govexitan.pdf
    • https://uploads.strikinglycdn.com/files/d74cdb89-b6c4-4ea4-99b9-fd18f963e2c1/97325423907.pdf
    • https://uploads.strikinglycdn.com/files/153e31e0-8012-43ca-99e3-d45ef2c60104/xifogisoxexapebazude.pdf
    • https://uploads.strikinglycdn.com/files/55880013-bab4-44b4-a205-0c586a8d64b9/how_to_pass_the_aswb_masters_exam.pdf
    • https://uploads.strikinglycdn.com/files/ef3094f7-1c0c-4040-896b-104a72cca655/how_to_lift_weights_without_hurting_your_back.pdf
    • https://uploads.strikinglycdn.com/files/15b07b64-6df7-4078-af5b-203cac798aaf/fudaxigimax.pdf
    • https://uploads.strikinglycdn.com/files/8a219c4b-63f0-4b47-a49b-20958f5dc609/67815686121.pdf
    • http://nifekubipaxo.epizy.com/nenamebozuwenoridiz.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_off0000f959.bin
0b95a4352d305c69c972dbf8cbf6aca1e2d781a25ac7c777968044cccaeb60e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF959 4928 bytes
font_01_sfnt_off00010a2e.bin
952edef4e1313e61cc410be287a8e5714069b7900dc847c2525297af2a1f73a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2E 11696 bytes
font_02_sfnt_off00013251.bin
2732c78df68b4531e26da51a256f0f9ab881cb8a96d1886ade34872d88eeece3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13251 16140 bytes

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