Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be83e8636766d37…

MALICIOUS

PDF

41.4 KB Created: 2020-11-05 22:32:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 28c44bf217e0e3e2fd4300607052a74a SHA-1: 97d951bd069eb6c75e8982afa353913ff4615ffe SHA-256: 6be83e8636766d3763141dc1cec7806ea29e7b37e41ffc4cd9f29d658a5c51ba
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous external links, with one specifically targeting 'change laptop password only', suggesting a phishing or credential harvesting attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may be designed to trick users into believing they need a password for an archive, a common tactic to bypass gateway security. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://traffset.ru/strik?keyword=change+laptop+password+only PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389805/normal_5f9d2961484a1.pdfIn PDF document text
    • https://dosedoduni.weebly.com/uploads/1/3/4/3/134347632/fujin-kagozin-fiwulefovadan-jufevokiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385231/normal_5f8fd86567b60.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/2122744.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/1cb697f6-fe73-467f-9e1f-852cb6ef2188/mepamuwirinebozipegawed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e744ef37-a79e-4116-84b3-d162485b3fe0/dediz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23c950e7-05e9-4fa1-b687-0fbdd0fd23c0/99407089666.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eabc7ad-2ce9-4ad4-beb9-d9771797a84f/pavekom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54162f3f-eed7-4a7a-9928-2b6e19f9c808/possessivartikel_im_nominativ_und_akkusativ_bungen.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/stump_root_1.0.0_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc5adbea-d0d3-41af-86d6-9283fb5ebaf9/20638846587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dec330c0-0da5-43c3-9830-b7b235e9b94a/pixogifugugatekot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/604c6f6f-a6f6-4db1-a6d3-c022e5f58f40/56700173923.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/komukigepoz.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_off000062db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62DB 5320 bytes
SHA-256: 1bf0d231b275e3c704d0978e9b65208de20098a828a5b46af0ad54f8c4d75232
font_01_sfnt_off000074fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74FA 10540 bytes
SHA-256: 711d203152f0747bda5178166f3c00069efa0b577b2a7e72cc470d066b8dd504

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