Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b404e9c2a05c10…

MALICIOUS

PDF

69.5 KB Created: 2020-11-20 01:44:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 270b8fcaa1d5f070204dbbbe347f6a71 SHA-1: 968efd27563bcc75a881d1b52807739ab739fb98 SHA-256: 55b404e9c2a05c101cbbd0a3c839eda7f2b30bca7cee0952a797b156c0161b10
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/strik?utm_term=the+three+magical+books+of+solomon+p PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409425/normal_5fa07f8712616.pdfIn PDF document text
    • https://vukegodepobaxi.weebly.com/uploads/1/3/4/6/134676750/40ebe6b14f7d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367964/normal_5f89ffde781e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414848/normal_5fa59f034fffd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387718/normal_5f91db197d694.pdfIn PDF document text
    • https://lujadogube.weebly.com/uploads/1/3/4/5/134522393/1c227a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453327/normal_5fae3add13ca3.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/diwitapezu/mijugedanan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07a89588-45f6-41ea-a491-a69fe6ec43cd/5349807675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff412b87-35a4-4c74-b6f0-fcdb415cd631/82759546616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e51b635-b98e-49c3-b405-90bb889783d4/bapivobepodabokimeraxigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25b170ae-4563-481e-9bf4-9abad80ae61e/94909370155.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7abb31a5-b5d6-4fed-a4ba-3b38b9546b53/zenisekixotofaderuvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21ef9c9d-f1b0-4033-84e6-f310c3dae62c/gimegazasub.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_off0000d22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22B 5584 bytes
SHA-256: 6d5866e2034ea503b0b518c47eb3c99a40f596f5e815e8d618c391af01252058
font_01_sfnt_off0000e4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FA 10492 bytes
SHA-256: 77633a724530a17160f50360c16d00a841379f1f51e039dca514fd716fe1bc70

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