Malicious PDF — malware analysis report

Static analysis result for SHA-256 8496daf98cd9f7fd…

MALICIOUS

PDF

69.7 KB Created: 2021-03-20 10:48:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27f994f704606ced44eda646bb6749c8 SHA-1: d28c6d47985ff9dc54c48e2d3cb380c22c74d7bf SHA-256: 8496daf98cd9f7fd781f108e0177689da7fd6583f9b522b9ab9abcdc48a6bd9a
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm or phishing operation. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution attempt, likely using embedded links to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://druttle.ru/wix?keyword=speedy+bail+bonds+abilene+texas
    • http://muwiduvepobuz.mygamesonline.org/limebore.pdf
    • http://bufibinokurun.scienceontheweb.net/golakumejumetusoda.pdf
    • http://kovatafob.mypressonline.com/41957303489.pdf
    • http://vuxetexab.22web.org/angariar_dicionario_informal.pdf
    • http://rapiwanijisage.scienceontheweb.net/oxygen_therapy_in_suspected_acute_myocardial_infarction.pdf
    • http://larebalin.mypressonline.com/scag_tiger_cat_belt_replacement.pdf
    • http://gajaxujifusokul.mygamesonline.org/fosimenijif.pdf
    • http://pugopumonerab.22web.org/pasevoxuvanorog.pdf
    • http://luziniwanemek.sportsontheweb.net/41202451235.pdf
    • https://static.s123-cdn-static.com/uploads/4488582/normal_5ff7f1445f13f.pdf
    • http://nufizurob.22web.org/hill_rom_progressa_bed_service_manual.pdf
    • http://wamuwosola.mygamesonline.org/godiduwajiguwizutunupis.pdf
    • https://cdn-cms.f-static.net/uploads/4420260/normal_604f193971322.pdf
    • http://rixadixiji.scienceontheweb.net/air_pollution_project_file.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/76378ed6-9a92-4ce9-af3f-8bd29ef6a7af/zaxbys_job_application.pdf
    • https://s3.amazonaws.com/lanaladu/12595752990.pdf
    • http://durenifujogax.myartsonline.com/gusixudifoluz.pdf
    • https://s3.amazonaws.com/votubukaxogilix/fusikejipaxobobodekod.pdf
    • https://uploads.strikinglycdn.com/files/538c5c1f-3e0f-4c52-a8df-b2b94a64aa0f/54818980148.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_off0000d1be.bin
e1c1458386492e940fa084c4b528067225f36aaf3b6092d38e9fb1276b72c4c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BE 5272 bytes
font_01_sfnt_off0000e3bf.bin
52f708c249d340bcfa782327367af9db2bc7796ed8d99be500a1d79449fac9e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BF 11248 bytes

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