Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1f7299794e1102…

MALICIOUS

PDF

77.3 KB Created: 2021-03-21 23:32:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 2b840de24fe0312497443f7c3a4e9c8a SHA-1: 90ffce3baaa8e6abacc42a04ec129ad7149b0556 SHA-256: 8d1f7299794e1102c82b17db5398e18eeee8811f6719c8c26b195efd2de133e3
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://ponafet.ru/award?keyword=solving+quadratic+equations+mixed+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/vuxeneson/ghdcjjH/dragons_of_atlantis_wiki_dragons.pdfIn PDF document text
    • https://cdn.sqhk.co/vewimidipiv/hcVWjek/kurasuduremubilaneba.pdfIn PDF document text
    • https://cdn.sqhk.co/govizanorev/dghjbzT/nba_live_mobile_basketball_hack_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/ySEX8if/space_jam_2_jersey.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/tCTI0ge/14776759314.pdfIn PDF document text
    • https://mulokigapasol.weebly.com/uploads/1/3/1/0/131070847/rupabu.pdfIn PDF document text
    • https://winomawapaba.weebly.com/uploads/1/3/5/3/135334931/petikad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/memobofilenabon/dixovagozufilep.pdfIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_af9993b67ad24cf7ad8da14a5fddc0c9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c14347a4-fbdd-443b-82f0-6e62fefdfc76/feng_shui_2021_for_horse.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/55504776972.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1981b609-fa27-4593-9745-6398bb004a64/suzitek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0bd8664-df96-426d-977c-cc290cba5f38/besawopukejukeled.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/how_to_change_from_factored_to_standard_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30b03f66-e7c6-4a0c-ab49-b925f15345ea/49488417787.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/memitojibabapekal.pdfIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_0d41ed280e8d46ea8161b122acfdec73.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/338d1dd6-37ac-4389-8ede-482dae336e03/36916685705.pdfIn PDF document text
    • https://807eaacf-9fb6-4e16-bcb8-061395d1d132.filesusr.com/ugd/a3ef2e_86656e1ffe504e3597473636fa018d1a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vunizi/wuwiteg.pdfIn PDF document text
    • https://46ebecaa-9490-439b-bba6-ee77f1a6ca93.filesusr.com/ugd/cee8a1_f6a8bde7fae94a02ac9bb572786184e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/o_level_maths_statistics_notes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF67 5964 bytes
SHA-256: aeebaadd36431e2d6b4849c57ffbdad3404950747eb657ea8cc588b1cd51fe92
font_01_sfnt_off0000f395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF395 10852 bytes
SHA-256: d36b14197bb04e0b9caee7ddc38f265c67a03ec4b113d64418c84d14e809b65a
font_02_sfnt_off000118d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D0 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c