Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8aec89a73c241f…

MALICIOUS

PDF

74.9 KB Created: 2021-04-01 19:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15059e290649e5070a134b35e9a6a15d SHA-1: 3aa11d283551050e2ef2dd7f1d098bcef7a97302 SHA-256: bc8aec89a73c241f821bfcae80a1ffc0529d784158a4f4e8cb59b321459834d9
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the heuristic firings point to a link farm strategy. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/123?utm_term=dagannoth+mother+guide+osrs
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/e362f1af0a.pdf
    • https://fewojejano.weebly.com/uploads/1/3/4/3/134348079/sunonutijubaraz-kewoz-resofe-bimemewo.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • http://azorocheat1.xyz/1887138014399pxp.pdf
    • https://pijusutuwo.weebly.com/uploads/1/3/1/4/131407307/436690.pdf
    • http://copyright-securityx.com/5939921053868j67.pdf
    • http://zebrait.fun/vox_cinema_dubai_emirates_malltfcm8.pdf
    • https://rumuzejisu.weebly.com/uploads/1/3/5/3/135349165/5671123.pdf
    • http://sojipen.22web.org/dijawen.pdf
    • http://it50life.pro/browning_a5_ultimate_12_gauge_shotgun8cpeg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_80568b7fee694756a83eca6752a1409c.pdf?index=true
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_00bd8e2f2c2d4612b8b1ff600b318c1f.pdf?index=true
    • https://s3.amazonaws.com/nilafafakem/ich_gmp_guidelines.pdf
    • http://jawozamamopenis.rf.gd/embedded_interview_questions_and_answers_for_freshers.pdf
    • https://s3.amazonaws.com/fumiposamisur/ks_academy_sap_may_2019_answer_key.pdf
    • https://s3.amazonaws.com/nedijowewoded/sulerunukivekewex.pdf
    • http://jawimazo.epizy.com/89673916180.pdf
    • http://kadelidiror.epizy.com/2007_jeep_grand_cherokee_crd_oil_capacity_location.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7be.bin
0d135859409788aa896e881648ad7ce7d3fa6feb0865082bfa3fbdfb79e7b224		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BE 5204 bytes
font_01_sfnt_off0000f94a.bin
130b24444eb7d3da89805447be9359aec438826d62aa3b1c381cdd805f8e1996		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 10992 bytes

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