Malicious PDF — malware analysis report

Static analysis result for SHA-256 4afc4d7450621bbd…

MALICIOUS

PDF

67.8 KB Created: 2020-11-11 19:48:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: aee944e20570d0f47494cd476f3d8dd2 SHA-1: dbffbd9a337f428da085db81d7e754e9c7e0708b SHA-256: 4afc4d7450621bbd790d15a122e1909ac24aa664e6fa1c02fe9d284c94a21132
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-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://traffking.ru/strik?utm_term=apple+airport+extreme+base+station+a1408+manual PDF link annotation
    • https://juluvolalo.weebly.com/uploads/1/3/4/4/134435755/453712136d.pdfIn PDF document text
    • https://ravidaxixow.weebly.com/uploads/1/3/4/3/134315840/xodozebolu.pdfIn PDF document text
    • https://gopogaxewose.weebly.com/uploads/1/3/4/0/134013169/likikokirakozuvovi.pdfIn PDF document text
    • https://gogebuzavoriro.weebly.com/uploads/1/3/2/6/132681212/tixoj.pdfIn PDF document text
    • https://tiralilibixadu.weebly.com/uploads/1/3/4/5/134500138/070f0572e77fc59.pdfIn PDF document text
    • https://laratenin.weebly.com/uploads/1/3/2/8/132816160/327524.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/5490a428-9b9d-49b8-a0bb-0f5f46bfbe3a/rude_dog_and_the_dweebs_intro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02f8a6a9-7a4a-4ba9-837b-85d702a4cee9/dekobotokomonodubob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77d845f2-d49e-492b-ad55-2a72e0467a42/82266059889.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e289b8f4-c658-4b47-b0f8-9b1ebeca94d8/winter_holiday_and_quote_cryptogram_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13f2d917-32c2-455b-9ed1-a5ddbd41b7b6/20886889460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1e29df9-c2f2-4740-9368-620abf8ab1dd/76260964716.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7b6d1f1-3425-4867-9723-8ae6ae47c7a4/69748014943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16877541-77e8-4bfb-9c21-bdcd0a95c7cd/kafizekujidirenuladeke.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_off0000cb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB30 5640 bytes
SHA-256: d159babbacb1d1843878c840f67e62caceb0e7abb295f117e693e8b26a4481ac
font_01_sfnt_off0000de53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE53 10600 bytes
SHA-256: c1bb11966494dcb9a3823b5fbcd0cc395f4b86b0b0ac7e9c014715670e4c1e8d

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