Malicious PDF — malware analysis report

Static analysis result for SHA-256 716221356943f8f1…

MALICIOUS

PDF

70.0 KB Created: 2020-11-10 02:05:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2da45ce5d169f10571682d0ba4f0373e SHA-1: b48873127789bb91b6944b896136cb3c7c86a3b5 SHA-256: 716221356943f8f168cc277a7cca95f5c37feadd8eb1ffaa2fd16274c5f13c9a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to 30 external PDFs. The document body, though heavily obfuscated, suggests a lure related to 'chapter 15 review acids and bases answers'. The presence of external URIs and the ML classifier's high confidence score indicate a malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://trafffe.ru/strik?keyword=chapter+15+review+acids+and+bases+answers PDF link annotation
    • https://xironudobavus.weebly.com/uploads/1/3/4/4/134461104/korekegoxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_5fa712e97611d.pdfIn PDF document text
    • https://miremewokar.weebly.com/uploads/1/3/0/7/130738658/setubaf-rajazokego-vasafivolu-zisidopimujenop.pdfIn PDF document text
    • https://xetutinafo.weebly.com/uploads/1/3/0/7/130775845/nomulomavikin-merofelegi-jefuba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409627/normal_5fa98357d1816.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370740/normal_5f926e7d4ba95.pdfIn PDF document text
    • https://bujugerevik.weebly.com/uploads/1/3/4/6/134677448/b68791.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9464a5a2-7111-4239-a874-563d3d3d883a/cullman_county_board_of_education_jobs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2911e08d-de62-4f87-9dea-4ab67f50e8d7/narelexunoladafugatovavu.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/plant_and_animal_cells_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22be1b00-2f21-4346-8f20-517695ca118b/suvavegoginufifexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e248e31b-59af-49ee-80b9-f3ce2bacbafb/20904382954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9e933b6-96dc-4b0c-ad73-392f260f17cc/dire_straits_brothers_in_arms_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64a9f617-7ef9-4e0d-bfe3-d85c37be2ec1/64567655560.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/79925530131.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_off0000d5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B9 5500 bytes
SHA-256: 3fa6e7228385f10e9f940e70d5609e87715ceb905be29af7ce95af1d51b16d61
font_01_sfnt_off0000e877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE877 10144 bytes
SHA-256: eef8f53f5844bffdcc072ae0aeaacef5366feb85d6cdafb8e5505df30d303479

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