Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ea5ea5ea921be1b…

MALICIOUS

PDF

78.9 KB Created: 2021-04-15 14:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0578a5f239cf94b7e48c685f334b5a41 SHA-1: f25f431253df6e25c67cae8ddd432dd0f753bbc4 SHA-256: 2ea5ea5ea921be1b6ead0abbed41cc1c4853eb022cf068d8321fdc8d27fbf613
186 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, many of which point to disposable hosting or redirectors, indicating a link farm designed to distribute malicious content. The presence of a URL with a 'utm_term' parameter suggests a phishing or SEO manipulation tactic. Although no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest it's a lure to a malicious site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nipisod.ru/strik?utm_term=where+is+sim+card+in+flip+phone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408987/normal_604eeeeb662fe.pdfIn PDF document text
    • http://sallehub.xyz/kezukapewizivafelilapmrj1.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/gomiwabiwimenadofefowewup1tzkq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470841/normal_5ff4a4d8efce9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453741/normal_5ffbaee7959a4.pdfIn PDF document text
    • https://pidilamobojuri.weebly.com/uploads/1/3/5/3/135310388/07e31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459625/normal_600d0da144e7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413587/normal_604936b2b86f7.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://romiwewigases.weebly.com/uploads/1/3/2/6/132682929/8757a6513.pdfIn PDF document text
    • http://teksol.xyz/what_is_an_angle_of_360_degrees_calledakun5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://52a1af19-6946-4c37-aba6-ab00a30e4874.filesusr.com/ugd/5dc3ca_ab9e03b9278d44718a02dfbefe9f4b28.pdf?index=trueIn PDF document text
    • https://91313464-3f42-441e-b0e8-b27065d471ad.filesusr.com/ugd/ee9d3f_52c1feebd3a540418049d128ff38968c.pdf?index=trueIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_caa71fc5202d4024bff5a0ef3d94334a.pdf?index=trueIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_7827265d3ecf4a8f97784f68efa793db.pdf?index=trueIn PDF document text
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_bb231ccc74084d5a97a2aadd48934d83.pdf?index=trueIn PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_a2a6b553a9fb4c9dae0884e1946582b4.pdf?index=trueIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_d51981e584ea41c39a9b793dcdef5fe6.pdf?index=trueIn PDF document text
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_81cdaee0bb8c44038a3c0a4a935584e5.pdf?index=trueIn PDF document text
    • https://37cc4ef3-276f-49d0-84f3-8bc08bbde6a9.filesusr.com/ugd/e4a5d4_513c42d9e0e84aef8c3fc40a36c14b3c.pdf?index=trueIn PDF document text
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_3aeeff8b67094a4db4bdad539d7749e2.pdf?index=trueIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_8703c56cb5044243a6b4202d2a117ba8.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68B 5408 bytes
SHA-256: bd001af3d015e06ee1652cdd6d834b51a741d4507feb926df47b1e170f536323
font_01_sfnt_off000108d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D8 10924 bytes
SHA-256: 265f2c62f2de887762e1802b9119d4867a20314b2e6198663f86ef26c1984cc7

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