Malicious PDF — malware analysis report

Static analysis result for SHA-256 38cd48dde849f547…

MALICIOUS

PDF

83.8 KB Created: 2021-03-22 10:03:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bf1365ee026b7f3564e1bd3ad6d3eb88 SHA-1: 1121f0d22d30c839b46f05f5c7a1dfcbedd11875 SHA-256: 38cd48dde849f547203ab6b554af00c8d448b471fcc87d089c02451ec70a4146
156 Risk Score

Malware Insights

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

This PDF contains a large number of external links, characteristic of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to exploit users through social engineering, potentially leading to the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://midufefew.ru/123?utm_term=2d+discrete+wavelet+transform+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481058/normal_5fc570f99311c.pdfIn PDF document text
    • https://vukekitap.weebly.com/uploads/1/3/1/4/131438073/dalogudopejopel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408718/normal_5ff3b769600b2.pdfIn PDF document text
    • https://laxivaxof.weebly.com/uploads/1/3/0/8/130874385/tonode.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475741/normal_5fdf54efe101f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414695/normal_60404bcfe1313.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461770/normal_603459b8f0084.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422906/normal_5fe51a8462b71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417805/normal_5ff7ea3685aa8.pdfIn PDF document text
    • https://wojedebaroz.weebly.com/uploads/1/3/1/6/131637691/2873.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375886/normal_6051e7a5107cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460228/normal_602a7a7daaf88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480589/normal_6028c38c0780d.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/78568209-7ee8-40f6-b5ea-a03d10c27b48/22841678517.pdfIn PDF document text
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_83830a7cccb54976ad3317c36dcf3f7c.pdf?index=trueIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_847866936d7544faa97ac39e40b3188f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/81a1ec06-c48a-481c-87e1-8facaeb36d69/washington_dc_news_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f112c34-510b-4843-a4f2-90d3b6dab10f/96379365088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb4aa46e-ace2-40c8-9377-2b99811906e0/wisiwotanixipororo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/226fa7af-c7e2-49a4-849b-194ecf221c0f/nawopu.pdfIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_65bef4dda99e4bceab27292ed7f05ac0.pdf?index=trueIn PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_220b35d38d3e475ca3ab8a54406215e3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b47f1b31-bcb8-477e-8598-46242c8ef50f/is_my_gf_on_dating_apps.pdfIn PDF document text
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_8d1310ae21294ec19ed0a457d47150df.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA39 4344 bytes
SHA-256: 6397bed69ebf1650382f3f042481274d259a95b4fe260b21663e82aea0aff6d4
font_01_sfnt_off0001096d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096D 5488 bytes
SHA-256: c31c8a81611ccdd1061fdb19c285806d5319ab614ab02dd2865958c0cf1c7c69
font_02_sfnt_off00011c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C21 11036 bytes
SHA-256: 5d93bd7815316361edda4df24f7ae8f81ec584765a76c9ad4fbc2103e8f8d76b