Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48f1a7a2e1e54b7…

MALICIOUS

PDF

89.1 KB Created: 2021-03-12 14:45:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8aa8731dc36ca53ee152a452264d0750 SHA-1: 1a0069e2ec1edb332c29fc236f0fe149d4d44031 SHA-256: a48f1a7a2e1e54b776bd0162ffb4ebb3b346127395004d7baecc35476bbc50fb
186 Risk Score

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 0.9985

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://dugedepap.ru/123?utm_term=cartoon+network+arena+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384304/normal_6035a604cf8f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465557/normal_5fc7acc5273e2.pdfIn PDF document text
    • https://kovapuneluwaze.weebly.com/uploads/1/3/2/3/132302913/420026.pdfIn PDF document text
    • https://metasabuvaro.weebly.com/uploads/1/3/2/6/132681671/pijasepopukoti-gapobo.pdfIn PDF document text
    • https://dapijapivabug.weebly.com/uploads/1/3/4/3/134338952/bekupadebib.pdfIn PDF document text
    • https://kojulijorivo.weebly.com/uploads/1/3/4/3/134329781/3315453.pdfIn PDF document text
    • https://kidubaviputotej.weebly.com/uploads/1/3/4/5/134520398/tukadumaxavun-roraketovidara-wonegujugivone-pesakoxivosajim.pdfIn PDF document text
    • http://duvotikuvazax.22web.org/kd-avx33_bluetooth_problem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464732/normal_604465c60b904.pdfIn PDF document text
    • https://lewovabarififu.weebly.com/uploads/1/3/1/4/131453312/zadodufugudimuseraki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452863/normal_6033c68bbc943.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476007/normal_5fe0bd5a67fec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zapofekeba.rf.gd/88905278867.pdfIn PDF document text
    • http://tezitap.rf.gd/electrolux_vacuum_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dc2ad24-c7a3-4441-bc46-25f4254981c6/bapabukosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2121afcb-dc22-46b7-b99b-c6a17dc1f0e3/64233461782.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94854f55-9bb5-4e69-afdd-f8f60ad56e7b/fibevobufirovaribilutip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0454a75d-739b-488b-ab3f-fde51b53f7e1/how_to_set_skyscan_atomic_clock_model_88901.pdfIn PDF document text
    • http://piperopire.rf.gd/sports_vocabulary_ielts.pdfIn PDF document text
    • http://numaripokusuj.rf.gd/nhtsa_sfst_student_manual_2015.pdfIn PDF document text
    • http://lewiwosu.epizy.com/tutawexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3c2909a-e4c3-4fa9-bf83-22790da1a0e2/67072107368.pdfIn PDF document text
    • http://mawekipabotore.epizy.com/hypertension_guidelines_2019_acc.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA8 4664 bytes
SHA-256: 0e3578a4f2cbf53a2802fd93ec87b57f831c636050ff70c3fc36a4f9fed26fca
font_01_sfnt_off0000ffa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA1 8592 bytes
SHA-256: 93523db672d191646c6db0ce5460654269b1a52e7026329ba9cffb31e1fccbd2
font_02_sfnt_off000119f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F3 11392 bytes
SHA-256: 9fe6b3e12fd345c39303fb88550d2e25020ea5ce3a996be88f7de855ae236630
font_03_sfnt_off0001411a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411A 16132 bytes
SHA-256: 781b55c37c9daf8e5670018ab8fb61fc3d4954543092af18141ab7e1cf23d573