Malicious PDF — malware analysis report

Static analysis result for SHA-256 184601f67b798ae5…

MALICIOUS

PDF

88.1 KB Created: 2021-02-07 10:37:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 61126388fd7e43c654e5d8bfce76d0c8 SHA-1: 90110d10d6f0bc88077b4612811bec5fe0e97c10 SHA-256: 184601f67b798ae510dbca9d041465e14b91c2ca7a333d78d0a148e955c7979c
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to external sites, and a critical heuristic firing for a "PDF_SEO_LINK_FARM" with 30 links. The document body, though malformed, suggests a lure related to an "answer key". The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://maypoin.ru/aws?utm_term=creatures+of+the+deep+answer+key PDF link annotation
    • http://vejobazure.22web.org/c_programs_for_practice_with_solutions.pdfIn PDF document text
    • https://pozimifekof.weebly.com/uploads/1/3/4/6/134674510/7371433.pdfIn PDF document text
    • http://zunowugijose.22web.org/liguzisafipamiride.pdfIn PDF document text
    • https://gufiferufa.weebly.com/uploads/1/3/2/3/132302963/1053778.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tojederetesez.epizy.com/48127361918.pdfIn PDF document text
    • http://vufilupirudote.rf.gd/welujuwukozuzexofopim.pdfIn PDF document text
    • http://zepurudevivo.rf.gd/wetarifir.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/vilaximekajopat.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/14269374827.pdfIn PDF document text
    • http://kenubuw.epizy.com/educated_tara_westover_book.pdfIn PDF document text
    • http://marabawem.rf.gd/gilogegozino.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/kizhakku_cheemayile_songs_tamilwire.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/disability_appeal_letter_template.pdfIn PDF document text
    • http://luxepiluwi.epizy.com/antagonismo_microbiano.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/natal_chart_horoscope_app_android.pdfIn PDF document text
    • http://vufigenetusanu.epizy.com/vuremiwesidizojapo.pdfIn PDF document text
    • http://jitumevadegoz.rf.gd/87187285162.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_off00011d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7C 5260 bytes
SHA-256: b0c271b9547ba09534d6711440b8b0ccbc83a0cbc65d51d505baf75219a983d4
font_01_sfnt_off00012f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6F 10448 bytes
SHA-256: 8410a4a950eede654234b46d9bc33057c71e344578aafd8d6db0c6a756670dcd

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