Malicious PDF — malware analysis report

Static analysis result for SHA-256 1731e0e7c2a9b379…

MALICIOUS

PDF

73.0 KB Created: 2021-01-16 21:35:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 63da7b9cb87437820d7e555562f55187 SHA-1: 736bd93ec8dd24a45ea13a6beb39c1802f37c96d SHA-256: 1731e0e7c2a9b3791406862f3a6983791f557f6372c2d2e9e20eeb0600a2ab3a
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is also flagged by ClamAV as a phishing trojan. The embedded URL is disguised as a link to game achievements, indicating a social engineering lure. While no scripts were explicitly extracted, the PDF structure and the malicious URL strongly suggest an attempt to redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://cctraff.ru/123?utm_term=learn+to+fly+idle+all+achievements In PDF document text
    • https://site-1168078.mozfiles.com/files/1168078/3110038264.pdfIn PDF document text
    • https://site-1199436.mozfiles.com/files/1199436/free_printable_algebra_worksheets_9th_grade.pdfIn PDF document text
    • https://site-1178770.mozfiles.com/files/1178770/enemy_waters_submarine_and_warship_battles_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466675/normal_5fd1d851bc918.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/9pUic3B/94766493201.pdfIn PDF document text
    • https://cdn.sqhk.co/kerosumumato/gvShgjd/101_in_1_games_ds.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/chemquest_answer_keys.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/divojafawopux.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/advanced_vocabulary_words_list.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/lockheed_martin_gps_iii_fact_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/migobu.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/how_to_answer_law_exam_questions_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/vestal_goodman_funeral_service.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38A 5152 bytes
SHA-256: 3691fef452066eca675c1f9fe0deee280dd17cec5029698d023a58c0b6a5e44d
font_01_sfnt_off0000e4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4ED 10392 bytes
SHA-256: 4af6d1c3af50cf19cd80c7d4a492f54d714c8465c33379cc4d84b88b744cf592
font_02_sfnt_off0001086e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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