Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c57ef27ac260000…

MALICIOUS

PDF

80.3 KB Created: 2021-02-22 05:43:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2eb60a19a0bc0cd9aa651e3c42effeb3 SHA-1: c1ff3529b84549cfbbcbfd4df5749986999cd2d8 SHA-256: 9c57ef27ac2600002d2a8d208fb7df4584c3728a051df1054a4537cbe4687e1d
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to potentially malicious or SEO-spam related content, including a critical redirector link to 'yafferge.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'big data tools', which is likely a pretext to encourage link clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+are+the+tools+used+in+big+data In PDF document text
    • https://boviseweduxiraz.weebly.com/uploads/1/3/0/7/130776594/ea6fbc9ca.pdfIn PDF document text
    • https://cdn.sqhk.co/nupegefozub/id2hihb/smash_the_mall_stress_fix_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/meduxemij/hgjjAhc/74531159732.pdfIn PDF document text
    • http://rafale.store/mogutojakiwowih9psn.pdfIn PDF document text
    • http://excschool.ru/75712819215aecwm.pdfIn PDF document text
    • https://cdn.sqhk.co/felodunom/C3Uiggg/tournament_organizer_software.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/0Aiaggc/soramemexapipixoke.pdfIn PDF document text
    • http://datingsexchat.site/82610391263x3csx.pdfIn PDF document text
    • https://cdn.sqhk.co/niripakexad/eja0zje/siwaxumibavol.pdfIn PDF document text
    • http://pivifemopore.22web.org/phonetic_transcription_exercises_with_answers_rp.pdfIn PDF document text
    • https://warodimaziwini.weebly.com/uploads/1/3/4/6/134611971/677c8305.pdfIn PDF document text
    • https://regenapewafixun.weebly.com/uploads/1/3/4/3/134364718/6012705.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/tulumanivowiridimewose.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/fonofatewetutidu.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/vesulimiz.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/sample_lab_report_discussion_biology.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/caa_membership_number_format.pdfIn PDF document text
    • http://radoletoma.epizy.com/punanegix.pdfIn PDF document text
    • http://pizoxuwa.epizy.com/51724679560.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/50071655088.pdfIn PDF document text
    • http://nevozabewovezo.epizy.com/96167128202.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEE 5240 bytes
SHA-256: 508411dba15351b56baaa372f0e7fd07a96040b79c34765d5e7726dcad453e58
font_01_sfnt_off000110bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BF 10372 bytes
SHA-256: 2761054156308d486ef9e477c5a21ff68446b4ee092b9e75ca28d8301135baab

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