Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb2c37f06d92b40…

MALICIOUS

PDF

80.0 KB Created: 2021-05-28 01:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 322e2351cba3c6d0b058702a8953d34f SHA-1: 5f66edb462bf43498fc29e0cf56282f611ca87ad SHA-256: afb2c37f06d92b400a6125a55e84b96b64d329faf93a5e68f2c66733a5b832a5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to a link farm, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing or a trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites, potentially for SEO spam or to host phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/123?utm_term=klasifikasi+batuan+sedimen+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476001/normal_603a43899b797.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375907/normal_600fc780ad1e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500882/normal_601259b911785.pdfIn PDF document text
    • https://navesurupuseg.weebly.com/uploads/1/3/3/9/133997449/5429284.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415742/normal_60228f8289101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460463/normal_6036be5002d00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493891/normal_5ff3b614f3ef1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379498/normal_601b1678b3130.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380383/normal_60330c636315a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459326/normal_6043132b427a2.pdfIn PDF document text
    • https://surarapumo.weebly.com/uploads/1/3/4/3/134305151/sifutimusun_rijiriderigini.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379387/normal_6052b5351e64e.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/3af46f40-06b7-47b2-8a1c-9e5c4cb86f8f/xururaxukanakob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a8a8e9b-09ea-4a13-b0ae-2060034c62be/car_coloring_pages_preschool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74abd151-c242-4d7a-9ae2-ac7634166170/ncees_promo_code_practice_exam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e959ee1b-4c77-40ca-a274-254b3b0616d5/another_phrase_for_quick_study.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6fad321-2528-484b-b04a-cd8d6a2527b4/84712203366.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e12cf56d-95c1-473b-a24f-940088b5e2c3/fefuwos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/265a1ad2-1f85-4fc7-9449-32dcf4780938/31928777204.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/551ea81d-77f7-42c6-a519-9cf6512b80ad/xoxokitezazidutimevogil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af88966c-f038-4308-b1a1-62f1a1a57b8f/70007947234.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_off0000fbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBD 5264 bytes
SHA-256: 2d2cadb49ac7dd5405ef47cb042870ffdbd08b89b90bd9da488451014f71fdd7
font_01_sfnt_off00010d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8F 10484 bytes
SHA-256: e9fec9a31cfde964ecd4ebe249d5fafaee5e4e1fe57eabe2a16c389dbaf63210

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