Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8964233c29a2aa4…

MALICIOUS

PDF

107.1 KB Created: 2021-04-01 21:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 581a31d19b89b8a345d1cd0079a6f60a SHA-1: 9173ef4cc6228f30739d136f8640519f1c523822 SHA-256: e8964233c29a2aa4ed2c1fe088d2a629ee4b8beff1922e458d7563e214314b7a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF SEO Link Farm' heuristic, pointing to various PDF files hosted on external services. The primary URL, 'https://nipisod.ru/wix?keyword=the+count+of+monte+cristo+questions+answers', suggests a keyword-based redirection mechanism. This pattern is indicative of SEO manipulation or a phishing lure, aiming to drive traffic to potentially malicious or deceptive content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nipisod.ru/wix?keyword=the+count+of+monte+cristo+questions+answers
    • https://xamelanaf.weebly.com/uploads/1/3/5/3/135331914/7622249.pdf
    • https://nutolifawivu.weebly.com/uploads/1/3/1/4/131437776/36a91.pdf
    • https://xubidanata.weebly.com/uploads/1/3/4/8/134895671/9392083.pdf
    • https://cdn.sqhk.co/pubabolab/hhhiZgf/18495308430.pdf
    • http://senoratikazunub.22web.org/20363812792.pdf
    • http://wonamesavap.iblogger.org/33853868874.pdf
    • https://cdn.sqhk.co/jifigetuxu/ghCVic7/simple_cure_for_stress_incontinence.pdf
    • https://ladifibefumuxuw.weebly.com/uploads/1/3/4/3/134353250/nuvotixumawa_lifiwowanijim.pdf
    • https://bopugokux.weebly.com/uploads/1/3/4/9/134901566/mifesiraberimovuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sivanira/angry_neighbor_mod.pdf
    • https://uploads.strikinglycdn.com/files/5d3cf9f1-68a8-45c4-a885-9233e7618561/45761400729.pdf
    • http://vopapokolozanum.rf.gd/canon_rc-6_remote_control_manual.pdf
    • https://s3.amazonaws.com/sifawekujiki/58970619962.pdf
    • https://s3.amazonaws.com/niporofez/how_to_get_rid_of_a_zit_in_ear.pdf
    • https://uploads.strikinglycdn.com/files/2b17195b-f095-4695-a6f5-284a9b8cfa88/job_stress_scale_questionnaire.pdf
    • https://s3.amazonaws.com/xufoxorog/74399205990.pdf
    • https://uploads.strikinglycdn.com/files/fa043951-2453-4653-8325-6c479db215cb/compare_and_contrast_two_physical_properties_of_apples_and_oranges.pdf
    • https://s3.amazonaws.com/bubeto/janoxebuve.pdf
    • https://uploads.strikinglycdn.com/files/e9c86134-ad7d-4b07-a88a-d5d267710189/lofijipofuniwuxabo.pdf
    • https://s3.amazonaws.com/dazinibonofobi/algebra_worksheets_year_7_tes.pdf
    • http://gogozibopuxut.epizy.com/bopofamoxasafetikoripi.pdf
    • https://uploads.strikinglycdn.com/files/755029f9-1c31-4ac7-bddb-ede1b0834aec/gezisuge.pdf
    • http://labazorev.rf.gd/the_braggest_font_free.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015b68.bin
a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B68 2828 bytes
font_01_sfnt_off00016562.bin
f772fce0d4d06569b2fc1111cf5eed3546b9fe297be0671a613aeac09b68a033
pdf-font-stream PDF embedded font (sfnt) at offset 0x16562 5256 bytes
font_02_sfnt_off0001772d.bin
68cf8d0facef0bfd70984a0fab1080c76d020a422da77bb3fded8ec3af3cfaef
pdf-font-stream PDF embedded font (sfnt) at offset 0x1772D 11732 bytes